[voq][chassis] VOQ cli show commands implementation (sonic-net#1689)

Changes in this commit
- Implementation of the following show commands for VOQ chassis.

show chassis system-ports [<system port>] {-n <namespace>}, if multi-asic voq chassis
show chassis system-ports [<system port>] , if single asic voq chassis
show chassis system-neighbors [<nbr ip address>] [-n <asic name>]
show chassis system-lags [<system lag>] [-n <asic name>] [-l <linecard or host name>]

- The existing chassis commands under "show chassis_modules" and
"config chassis_modules" have been renamed (moved) under
"show chassis modules" and "config chassis modules" respectively

Signed-off-by: vedganes <vedavinayagam.ganesan@nokia.com>

config/chassis_modules.py

@@ -8,14 +8,19 @@
 # 'chassis_modules' group ('config chassis_modules ...')
 #
 @click.group(cls=clicommon.AliasedGroup)
-def chassis_modules():
-    """Configure chassis-modules options"""
+def chassis():
+    """Configure chassis commands group"""
+    pass
+
+@chassis.group()
+def modules():
+    """Configure chassis modules"""
     pass
 
 #
 # 'shutdown' subcommand ('config chassis_modules shutdown ...')
 #
-@chassis_modules.command('shutdown')
+@modules.command('shutdown')
 @clicommon.pass_db
 @click.argument('chassis_module_name', metavar='<module_name>', required=True)
 def shutdown_chassis_module(db, chassis_module_name):
@@ -34,7 +39,7 @@ def shutdown_chassis_module(db, chassis_module_name):
 #
 # 'startup' subcommand ('config chassis_modules startup ...')
 #
-@chassis_modules.command('startup')
+@modules.command('startup')
 @clicommon.pass_db
 @click.argument('chassis_module_name', metavar='<module_name>', required=True)
 def startup_chassis_module(db, chassis_module_name):

config/main.py

@@ -981,7 +981,7 @@ def config(ctx):
 config.add_command(aaa.aaa)
 config.add_command(aaa.tacacs)
 config.add_command(aaa.radius)
-config.add_command(chassis_modules.chassis_modules)
+config.add_command(chassis_modules.chassis)
 config.add_command(console.console)
 config.add_command(feature.feature)
 config.add_command(kdump.kdump)