[202205] Fixed set mtu for deleted subintf due to late notification #2595
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PR against 202205 based on the following PR: #2571
What I did
Ignores errors on the set MTU command for subinterface when the subinterface state is not OK.
Why I did it
A race condition between the portmgrd and the intfmgrd sometimes causes running a set MTU command on a deleted subinterface.
The logs and the error:
How I verified it
Run the test_loopback_action_reload test and saw no errors in the logs.
Details if related