Revert "[route_check] fix IPv6 address handling (sonic-net#2722)"

This reverts commit ff68832.

Author: StormLiangMS

scripts/route_check.py

@@ -47,7 +47,6 @@
 import traceback
 import subprocess
 
-from ipaddress import ip_network
 from swsscommon import swsscommon
 from utilities_common import chassis
 
@@ -146,7 +145,7 @@ def add_prefix(ip):
         ip = ip + PREFIX_SEPARATOR + "32"
     else:
         ip = ip + PREFIX_SEPARATOR + "128"
-    return str(ip_network(ip))
+    return ip
 
 
 def add_prefix_ifnot(ip):
@@ -155,7 +154,7 @@ def add_prefix_ifnot(ip):
     :param ip: IP to add prefix as string.
     :return ip with prefix
     """
-    return str(ip_network(ip)) if ip.find(PREFIX_SEPARATOR) != -1 else add_prefix(ip)
+    return ip if ip.find(PREFIX_SEPARATOR) != -1 else add_prefix(ip)
 
 
 def is_local(ip):

tests/route_check_test_data.py

@@ -462,22 +462,4 @@
         },
         RET: -1,
     },
-    "10": {
-        DESCR: "basic good one with IPv6 address",
-        ARGS: "route_check -m INFO -i 1000",
-        PRE: {
-            APPL_DB: {
-                ROUTE_TABLE: {
-                },
-                INTF_TABLE: {
-                    "PortChannel1013:2000:31:0:0::1/64": {},
-                }
-            },
-            ASIC_DB: {
-                RT_ENTRY_TABLE: {
-                    RT_ENTRY_KEY_PREFIX + "2000:31::1/128" + RT_ENTRY_KEY_SUFFIX: {},
-                }
-            }
-        }
-    },
 }