[202205][yang]Add missing fields in PortChannel yang model #14232
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Porting fix #14045 to 202205. 202205 doesn't have fast_rate and hence only fallback is updated in yang model
Why I did it
Added Missing fields in sonic-portchannel yang model.
"fallback" is present in configuration schema but not in yang model. This leads to traceback when yang is validated
How I did it
Updated yang model
How to verify it
Added tests to verify
Which release branch to backport (provide reason below if selected)
Description for the changelog
Ensure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.
Link to config_db schema for YANG module changes
Part of the PR
A picture of a cute animal (not mandatory but encouraged)