[show] Added alias interface mode support for 'show interfaces counters ...' command (#2468)

Fixes #2464

#### What I did
This change fixed "show interfaces counters xxx" output nothing when naming mode is alias. 

#### How I did it
Convert the alias name into interface name for "show interfaces counters -u xxx", "show interfaces counters detailed xxx" and "show interfaces counters rif xxx" subcommands.

#### How to verify it
1. Set interface naming mode to alias.
2. Logout/Login.
3. Verify "show interfaces counters -i Eth1".
4. Verify "show interfaces counters rif Eth1".
5. Verify "show interfaces counters detailed Eth1".
6. Set interface naming mode to default.
7. Logout/Login
8. Repeat step 3~5.

Author: puffc

show/interfaces/__init__.py

@@ -578,6 +578,7 @@ def counters(ctx, verbose, period, interface, printall, namespace, display):
         if period is not None:
             cmd += " -p {}".format(period)
         if interface is not None:
+            interface = try_convert_interfacename_from_alias(ctx, interface)
             cmd += " -i {}".format(interface)
         else:
             cmd += " -s {}".format(display)
@@ -643,10 +644,13 @@ def rates(verbose, period, namespace, display):
 def rif(interface, period, verbose):
     """Show interface counters"""
 
+    ctx = click.get_current_context()
+
     cmd = "intfstat"
     if period is not None:
         cmd += " -p {}".format(period)
     if interface is not None:
+        interface = try_convert_interfacename_from_alias(ctx, interface)
         cmd += " -i {}".format(interface)
 
     clicommon.run_command(cmd, display_cmd=verbose)
@@ -659,10 +663,13 @@ def rif(interface, period, verbose):
 def detailed(interface, period, verbose):
     """Show interface counters detailed"""
 
+    ctx = click.get_current_context()
+
     cmd = "portstat -l"
     if period is not None:
         cmd += " -p {}".format(period)
     if interface is not None:
+        interface = try_convert_interfacename_from_alias(ctx, interface)
         cmd += " -i {}".format(interface)
 
     clicommon.run_command(cmd, display_cmd=verbose)