Add Checkpoint and Rollback for Multi ASIC. (sonic-net#3299)

#### What I did

Add `config` `checkpoint`, `rollback`, `replace`, `list-checkpoints`, `delete-checkpoint` support of Multi ASIC

#### How I did it
Add namespace for each of operation to support Multi ASIC.

#### How to verify it
1. Single ASIC
```admin@str2-msn2700-spy-1:~/gcu$ sudo config checkpoint 20240522-xincun
Config Rollbacker: Config checkpoint starting.
Config Rollbacker: Checkpoint name: 20240522-xincun.
Config Rollbacker: Getting current config db.
Config Rollbacker: Getting checkpoint full-path.
Config Rollbacker: Ensuring checkpoint directory exist.
Config Rollbacker: Saving config db content to /etc/sonic/checkpoints/20240522-xincun.cp.json.
Config Rollbacker: Config checkpoint completed.
Checkpoint created successfully.

admin@str2-msn2700-spy-1:~/gcu$ sudo config list-checkpoints 
[
    "20240522-xincun"
]

admin@str2-msn2700-spy-1:~/gcu$ sudo config rollback 20240522-xincun
Config Rollbacker: Config rollbacking starting.
Config Rollbacker: Checkpoint name: 20240522-xincun.
Config Rollbacker: Verifying '20240522-xincun' exists.
Config Rollbacker: Loading checkpoint into memory.
Config Rollbacker: Replacing config using 'Config Replacer'.
Config Replacer: Config replacement starting.
Config Replacer: Target config length: 71214.
Config Replacer: Getting current config db.
Config Replacer: Generating patch between target config and current config db.
Config Replacer: Applying patch using 'Patch Applier'.
Patch Applier: localhost: Patch application starting.
Patch Applier: localhost: Patch: []
Patch Applier: localhost getting current config db.
Patch Applier: localhost: simulating the target full config after applying the patch.
Patch Applier: localhost: validating all JsonPatch operations are permitted on the specified fields
Patch Applier: localhost: validating target config does not have empty tables,
                               since they do not show up in ConfigDb.
Patch Applier: localhost: sorting patch updates.
Patch Applier: The localhost patch was converted into 0 changes.
Patch Applier: localhost: applying 0 changes in order.
Patch Applier: localhost: verifying patch updates are reflected on ConfigDB.
Patch Applier: localhost patch application completed.
Config Replacer: Verifying config replacement is reflected on ConfigDB.
Config Replacer: Config replacement completed.
Config Rollbacker: Config rollbacking completed.
Config rolled back successfully.

admin@str2-msn2700-spy-1:~/gcu$ sudo config delete-checkpoint 20240522-xincun
Config Rollbacker: Deleting checkpoint starting.
Config Rollbacker: Checkpoint name: 20240522-xincun.
Config Rollbacker: Checking checkpoint exists.
Config Rollbacker: Deleting checkpoint.
Config Rollbacker: Deleting checkpoint completed.
Checkpoint deleted successfully.

admin@str2-msn2700-spy-1:~/gcu$ sudo config list-checkpoints 
[]
```

2. Multi ASIC
```
stli@str2-7250-2-lc01:~/gcu$ sudo config checkpoint 20240522-xincun
MultiASICConfigRollbacker: Config checkpoint starting.
MultiASICConfigRollbacker: Checkpoint name: 20240522-xincun.
MultiASICConfigRollbacker: Getting current  config db.
MultiASICConfigRollbacker: Getting current asic0 config db.
MultiASICConfigRollbacker: Getting current asic1 config db.
MultiASICConfigRollbacker: Getting checkpoint full-path.
MultiASICConfigRollbacker: Ensuring checkpoint directory exist.
MultiASICConfigRollbacker: Saving config db content to /etc/sonic/checkpoints/20240522-xincun.cp.json.
MultiASICConfigRollbacker: Config checkpoint completed.
Checkpoint created successfully.
stli@str2-7250-2-lc01:~/gcu$ sudo config list-checkpoints 
[
    "20240522-xincun"
]

stli@str2-7250-2-lc01:~/gcu$ sudo config rollback 20240522-xincun
MultiASICConfigRollbacker: Config rollbacking starting.
MultiASICConfigRollbacker: Checkpoint name: 20240522-xincun.
MultiASICConfigRollbacker: Verifying '20240522-xincun' exists.
MultiASICConfigRollbacker: Loading checkpoint '20240522-xincun' into memory.
MultiASICConfigRollbacker: Replacing config '20240522-xincun' using 'Config Replacer'.
Config Replacer: Config replacement starting.
Config Replacer: Target config length: 38147.
Config Replacer: Getting current config db.
Config Replacer: Generating patch between target config and current config db.
Config Replacer: Applying patch using 'Patch Applier'.
Patch Applier: localhost: Patch application starting.
Patch Applier: localhost: Patch: []
Patch Applier: localhost getting current config db.
Patch Applier: localhost: simulating the target full config after applying the patch.
Patch Applier: localhost: validating all JsonPatch operations are permitted on the specified fields
Patch Applier: localhost: validating target config does not have empty tables,
                               since they do not show up in ConfigDb.
Patch Applier: localhost: sorting patch updates.
Patch Applier: The localhost patch was converted into 0 changes.
Patch Applier: localhost: applying 0 changes in order.
Patch Applier: localhost: verifying patch updates are reflected on ConfigDB.
Patch Applier: localhost patch application completed.
Config Replacer: Verifying config replacement is reflected on ConfigDB.
Config Replacer: Config replacement completed.
Config Replacer: Config replacement starting.
Config Replacer: Target config length: 97546.
Config Replacer: Getting current config db.
Config Replacer: Generating patch between target config and current config db.
Config Replacer: Applying patch using 'Patch Applier'.
Patch Applier: asic0: Patch application starting.
Patch Applier: asic0: Patch: []
Patch Applier: asic0 getting current config db.
Patch Applier: asic0: simulating the target full config after applying the patch.
Patch Applier: asic0: validating all JsonPatch operations are permitted on the specified fields
Patch Applier: asic0: validating target config does not have empty tables,
                               since they do not show up in ConfigDb.
Patch Applier: asic0: sorting patch updates.
Patch Applier: The asic0 patch was converted into 0 changes.
Patch Applier: asic0: applying 0 changes in order.
Patch Applier: asic0: verifying patch updates are reflected on ConfigDB.
Patch Applier: asic0 patch application completed.
Config Replacer: Verifying config replacement is reflected on ConfigDB.
Config Replacer: Config replacement completed.
Config Replacer: Config replacement starting.
Config Replacer: Target config length: 97713.
Config Replacer: Getting current config db.
Config Replacer: Generating patch between target config and current config db.
Config Replacer: Applying patch using 'Patch Applier'.
Patch Applier: asic1: Patch application starting.
Patch Applier: asic1: Patch: []
Patch Applier: asic1 getting current config db.
Patch Applier: asic1: simulating the target full config after applying the patch.
Patch Applier: asic1: validating all JsonPatch operations are permitted on the specified fields
Patch Applier: asic1: validating target config does not have empty tables,
                               since they do not show up in ConfigDb.
Patch Applier: asic1: sorting patch updates.
Patch Applier: The asic1 patch was converted into 0 changes.
Patch Applier: asic1: applying 0 changes in order.
Patch Applier: asic1: verifying patch updates are reflected on ConfigDB.
Patch Applier: asic1 patch application completed.
Config Replacer: Verifying config replacement is reflected on ConfigDB.
Config Replacer: Config replacement completed.
MultiASICConfigRollbacker: Config rollbacking completed.
Config rolled back successfully.

stli@str2-7250-2-lc01:~/gcu$ sudo config delete-checkpoint 20240522-xincun
MultiASICConfigRollbacker: Deleting checkpoint starting.
MultiASICConfigRollbacker: Checkpoint name: 20240522-xincun.
MultiASICConfigRollbacker: Checking checkpoint: 20240522-xincun exists.
MultiASICConfigRollbacker: Deleting checkpoint: 20240522-xincun.
MultiASICConfigRollbacker: Deleting checkpoint: 20240522-xincun completed.
Checkpoint deleted successfully.
stli@str2-7250-2-lc01:~/gcu$ sudo config list-checkpoints 
[]

stli@str2-7250-2-lc01:~/gcu$ sudo config replace 20240522-xincun.cp.json 
Config Replacer: Config replacement starting.
Config Replacer: Target config length: 38147.
Config Replacer: Getting current config db.
Config Replacer: Generating patch between target config and current config db.
Config Replacer: Applying patch using 'Patch Applier'.
Patch Applier: localhost: Patch application starting.
Patch Applier: localhost: Patch: []
Patch Applier: localhost getting current config db.
Patch Applier: localhost: simulating the target full config after applying the patch.
Patch Applier: localhost: validating all JsonPatch operations are permitted on the specified fields
Patch Applier: localhost: validating target config does not have empty tables,
                               since they do not show up in ConfigDb.
Patch Applier: localhost: sorting patch updates.
Patch Applier: The localhost patch was converted into 0 changes.
Patch Applier: localhost: applying 0 changes in order.
Patch Applier: localhost: verifying patch updates are reflected on ConfigDB.
Patch Applier: localhost patch application completed.
Config Replacer: Verifying config replacement is reflected on ConfigDB.
Config Replacer: Config replacement completed.
Config Replacer: Config replacement starting.
Config Replacer: Target config length: 97546.
Config Replacer: Getting current config db.
Config Replacer: Generating patch between target config and current config db.
Config Replacer: Applying patch using 'Patch Applier'.
Patch Applier: asic0: Patch application starting.
Patch Applier: asic0: Patch: []
Patch Applier: asic0 getting current config db.
Patch Applier: asic0: simulating the target full config after applying the patch.
Patch Applier: asic0: validating all JsonPatch operations are permitted on the specified fields
Patch Applier: asic0: validating target config does not have empty tables,
                               since they do not show up in ConfigDb.
Patch Applier: asic0: sorting patch updates.
Patch Applier: The asic0 patch was converted into 0 changes.
Patch Applier: asic0: applying 0 changes in order.
Patch Applier: asic0: verifying patch updates are reflected on ConfigDB.
Patch Applier: asic0 patch application completed.
Config Replacer: Verifying config replacement is reflected on ConfigDB.
Config Replacer: Config replacement completed.
Config Replacer: Config replacement starting.
Config Replacer: Target config length: 97713.
Config Replacer: Getting current config db.
Config Replacer: Generating patch between target config and current config db.
Config Replacer: Applying patch using 'Patch Applier'.
Patch Applier: asic1: Patch application starting.
Patch Applier: asic1: Patch: []
Patch Applier: asic1 getting current config db.
Patch Applier: asic1: simulating the target full config after applying the patch.
Patch Applier: asic1: validating all JsonPatch operations are permitted on the specified fields
Patch Applier: asic1: validating target config does not have empty tables,
                               since they do not show up in ConfigDb.
Patch Applier: asic1: sorting patch updates.
Patch Applier: The asic1 patch was converted into 0 changes.
Patch Applier: asic1: applying 0 changes in order.
Patch Applier: asic1: verifying patch updates are reflected on ConfigDB.
Patch Applier: asic1 patch application completed.
Config Replacer: Verifying config replacement is reflected on ConfigDB.
Config Replacer: Config replacement completed.
Config replaced successfully.
```

Author: xincunli-sonic

config/main.py

@@ -1184,7 +1184,7 @@ def apply_patch_for_scope(scope_changes, results, config_format, verbose, dry_ru
     scope_for_log = scope if scope else HOST_NAMESPACE
     try:
         # Call apply_patch with the ASIC-specific changes and predefined parameters
-        GenericUpdater(namespace=scope).apply_patch(jsonpatch.JsonPatch(changes),
+        GenericUpdater(scope=scope).apply_patch(jsonpatch.JsonPatch(changes),
                                                     config_format,
                                                     verbose,
                                                     dry_run,

generic_config_updater/change_applier.py

@@ -16,6 +16,7 @@
 
 print_to_console = False
 
+
 def set_verbose(verbose=False):
     global print_to_console, logger
 
@@ -34,11 +35,12 @@ def log_error(m):
     logger.log(logger.LOG_PRIORITY_ERROR, m, print_to_console)
 
 
-def get_config_db(namespace=multi_asic.DEFAULT_NAMESPACE):
-    config_db = ConfigDBConnector(use_unix_socket_path=True, namespace=namespace)
+def get_config_db(scope=multi_asic.DEFAULT_NAMESPACE):
+    config_db = ConfigDBConnector(use_unix_socket_path=True, namespace=scope)
     config_db.connect()
     return config_db
 
+
 def set_config(config_db, tbl, key, data):
     config_db.set_entry(tbl, key, data)
 
@@ -61,11 +63,9 @@ class DryRunChangeApplier:
     def __init__(self, config_wrapper):
         self.config_wrapper = config_wrapper
 
-
     def apply(self, change):
         self.config_wrapper.apply_change_to_config_db(change)
 
-
     def remove_backend_tables_from_config(self, data):
         return data
 
@@ -74,9 +74,9 @@ class ChangeApplier:
 
     updater_conf = None
 
-    def __init__(self, namespace=multi_asic.DEFAULT_NAMESPACE):
-        self.namespace = namespace
-        self.config_db = get_config_db(self.namespace)
+    def __init__(self, scope=multi_asic.DEFAULT_NAMESPACE):
+        self.scope = scope
+        self.config_db = get_config_db(self.scope)
         self.backend_tables = [
             "BUFFER_PG",
             "BUFFER_PROFILE",
@@ -86,7 +86,6 @@ def __init__(self, namespace=multi_asic.DEFAULT_NAMESPACE):
             with open(UPDATER_CONF_FILE, "r") as s:
                 ChangeApplier.updater_conf = json.load(s)
 
-
     def _invoke_cmd(self, cmd, old_cfg, upd_cfg, keys):
         # cmd is in the format as <package/module name>.<method name>
         #
@@ -98,7 +97,6 @@ def _invoke_cmd(self, cmd, old_cfg, upd_cfg, keys):
 
         return method_to_call(old_cfg, upd_cfg, keys)
 
-
     def _services_validate(self, old_cfg, upd_cfg, keys):
         lst_svcs = set()
         lst_cmds = set()
@@ -124,7 +122,6 @@ def _services_validate(self, old_cfg, upd_cfg, keys):
             log_debug("service invoked: {}".format(cmd))
         return 0
 
-
     def _upd_data(self, tbl, run_tbl, upd_tbl, upd_keys):
         for key in set(run_tbl.keys()).union(set(upd_tbl.keys())):
             run_data = run_tbl.get(key, None)
@@ -135,20 +132,17 @@ def _upd_data(self, tbl, run_tbl, upd_tbl, upd_keys):
                 upd_keys[tbl][key] = {}
                 log_debug("Patch affected tbl={} key={}".format(tbl, key))
 
-
     def _report_mismatch(self, run_data, upd_data):
         log_error("run_data vs expected_data: {}".format(
             str(jsondiff.diff(run_data, upd_data))[0:40]))
 
-
     def apply(self, change):
         run_data = self._get_running_config()
         upd_data = prune_empty_table(change.apply(copy.deepcopy(run_data)))
         upd_keys = defaultdict(dict)
 
         for tbl in sorted(set(run_data.keys()).union(set(upd_data.keys()))):
-            self._upd_data(tbl, run_data.get(tbl, {}),
-                    upd_data.get(tbl, {}), upd_keys)
+            self._upd_data(tbl, run_data.get(tbl, {}), upd_data.get(tbl, {}), upd_keys)
 
         ret = self._services_validate(run_data, upd_data, upd_keys)
         if not ret:
@@ -168,9 +162,9 @@ def remove_backend_tables_from_config(self, data):
 
     def _get_running_config(self):
         _, fname = tempfile.mkstemp(suffix="_changeApplier")
-        
-        if self.namespace:
-            cmd = ['sonic-cfggen', '-d', '--print-data', '-n', self.namespace]
+
+        if self.scope:
+            cmd = ['sonic-cfggen', '-d', '--print-data', '-n', self.scope]
         else:
             cmd = ['sonic-cfggen', '-d', '--print-data']
 
@@ -181,7 +175,9 @@ def _get_running_config(self):
         return_code = result.returncode
         if return_code:
             os.remove(fname)
-            raise GenericConfigUpdaterError(f"Failed to get running config for namespace: {self.namespace}, Return code: {return_code}, Error: {err}")
+            raise GenericConfigUpdaterError(
+                f"Failed to get running config for scope: {self.scope}," +
+                f"Return code: {return_code}, Error: {err}")
 
         run_data = {}
         try: