Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-3.1'
  to e1af5cb3239913d7bdc9116e6994c93a61c83306
  - Merge branch 'stable-3.0' into stable-3.1
    
    * stable-3.0:
      PushOne: Log when skipping deletion of ref
    
    Change-Id: I9ae39ad91f7e6d05d1e9d63b65afe4a05aa6f8f2
    
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      PushOne: Log when skipping deletion of ref
    
    Change-Id: I9d7d08e8c8a19ed6bbbb2c4a16287a8d9b51aa54
    
  - PushOne: Log when skipping deletion of ref
    
    Change-Id: I16c2076d6bcb6f512c79bb02509414d350beca2a
    
GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit