[202205][subinterface]Added additional checks in portchannel and subinterface commands (#2345) #2371
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Backport of #2345
*Added additional checks in subinterface and portchannel commands so they don't conflict. Without the checks, a subinterface could be created on a portchannel member and vice versa which will lead to SAI failure followed by orchagent crash.
What I did
Added additional checks in subinterface and portchannel commands so they don't conflict. Without the checks, a subinterface could be created on a portchannel member and vice versa which will lead to SAI failure followed by orchagent crash.
How I did it
Added checks in relevant config functions.
How to verify it
Added UT to verify it.
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)