Fix portmgr write partial port config to app DB issue. #3304
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Fix portmgr write partial port config to app DB issue.
Why I did it
Test case test_add_remove_neg_admin_status unstable.
Work item tracking
How I did it
Improve portmgr code to write all port config with one API call.
How to verify it
Pass all UT.
Manually verify issue fixed.
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Fix portmgr write partial port config to app DB issue.
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)