Gives cisco-8000 more flexibility to easily add subcommnads under sho…

…w platform (#2213)

What I did
Gave cisco-8000 the ability to add sub-commands under show platform <> in our downstream repo. Currently every time we want to add/remove/update a cli, we must raise a PR upstream.

How I did it
I have the cisco-8000.py module import a list of click commands that are written in a module that is located in our platform code.

How to verify it
Run show platform -h to see all commands. We will be able to see show platform inventory. This is only available on cisco devices.

show/plugins/cisco-8000.py

@@ -1,36 +1,25 @@
 #!/usr/bin/env python
 #########################################################
-# Copyright 2021 Cisco Systems, Inc.
+# Copyright 2021-2022 Cisco Systems, Inc.
 # All rights reserved.
 #
 # CLI Extensions for show command
 #########################################################
 
 try:
-    import click
-    import yaml
-    from show import platform
     from sonic_py_common import device_info
     import utilities_common.cli as clicommon
 except ImportError as e:
-    raise ImportError("%s - required module not found" % str(e))
+    raise ImportError("%s - required module not found".format(str(e)))
 
-PLATFORM_PY = '/opt/cisco/bin/platform.py'
-
-@click.command()
-def inventory():
-    """Show Platform Inventory"""
-    args = [ PLATFORM_PY, 'inventoryshow' ]
-    clicommon.run_command(args)
+try:
+    from sonic_platform.cli import PLATFORM_CLIS
+except ImportError:
+    PLATFORM_CLIS = []
 
-@click.command()
-def idprom():
-    """Show Platform Idprom Inventory"""
-    args = [ PLATFORM_PY, 'idprom' ]
-    clicommon.run_command(args)
 
 def register(cli):
-    version_info = device_info.get_sonic_version_info() 
-    if (version_info and version_info.get('asic_type') == 'cisco-8000'):
-        cli.commands['platform'].add_command(inventory)
-        cli.commands['platform'].add_command(idprom)
+    version_info = device_info.get_sonic_version_info()
+    if version_info and version_info.get("asic_type") == "cisco-8000":
+        for c in PLATFORM_CLIS:
+            cli.commands["platform"].add_command(c)