Do not configure physical attributes on port channels in portconfig

[stephenxs]

What I did

portconfig is a utility designed to configure various attributes on a physical port or a port channel.
It should reject the operation that a user wants to configure an attribute that will be inserted into CONFIG_DB.PORT table on a port channel. Otherwise, it will generate an entry for the port channel, which causes orchagent to be aborted.

Eg. the following commands

admin@sonic:~$ sudo config portchannel add PortChannel0001
admin@sonic:~$ sudo config interface speed PortChannel0001 100000

will cause the following error

Oct 26 04:50:27.055970 sonic ERR swss#orchagent: :- meta_sai_validate_oid: oid is set to null object id on SAI_OBJECT_TYPE_PORT
Oct 26 04:50:27.055970 sonic ERR swss#orchagent: :- getPortSupportedSpeeds: Failed to get a list of supported speeds for port PortChannel0001 id=0. Error=-5
Oct 26 04:50:27.057062 sonic ERR swss#orchagent: :- set: switch id oid:0x0 doesn't exist
Oct 26 04:50:27.057062 sonic ERR swss#orchagent: :- handleSaiSetStatus: Encountered failure in set operation, exiting orchagent, SAI API: SAI_API_PORT, status: SAI_STATUS_INVALID_PARAMETER
Oct 26 04:50:27.606521 sonic INFO swss#supervisord 2022-10-26 01:50:27,605 INFO exited: orchagent (terminated by SIGABRT (core dumped); not expected)

After the fix, configuring physical attributes on a port channel will be rejected

admin@sonic:~$ sudo config portchannel add PortChannel0001
admin@sonic:~$ sudo config interface speed PortChannel0001 100000
Invalid port PortChannel0001

Signed-off-by: Stephen Sun stephens@nvidia.com

How I did it

How to verify it

Unit test

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)

[stephenxs]

@prgeor kindly reminder to review this PR. thanks.