[GCU] Marking fields under MIRROR_SESSION as create-only #2104
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What I did
Fix #2068
Changes to fields under MIRROR_SESSION using GCU are not reflected and removal will result in orchagent crash unless each key is deleted and added back. This means the fields are create-only.
How I did it
Mark the fields under MIRROR_SESSION as create-only
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)