Added cisco config platform commands (sonic-net#2242)

What I did
Add cisco sub-command option under 'config platform' command

How I did it
In config/main.py, check the platform type and import the cisco.py file under cisco platform code when it's cisco-8000.

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

Signed-off-by: Yucai Gu yucgu@cisco.com

config/main.py

@@ -1209,6 +1209,10 @@ def config(ctx):
         print("Caught an exception: " + str(e))
         raise click.Abort()
 
+    if asic_type == 'cisco-8000':
+        from sonic_platform.cli.cisco import cisco
+        platform.add_command(cisco)
+
     # Load database config files
     load_db_config()