Disable code-owners for Merged and Abandoned changes
Disable code-owners for Merged and Abandoned changes

We already hide the code-owners status for each files when all
code-owners have voted on the change. When change is merged it is
consistent and when change is abandoned it is not useful anymore.

Change-Id: Ifa355fc61505f37b0bfe4a2dd525ff1b69355201

GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners