Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-2.16'
  to 3c764785b62efea8038650dc6d2f7cb8d740972c
  - Don't wait for pending events to process on startup
    
    Previously, on large Gerrit installations with many projects and/or many
    replication destinations, the replication plugin could take very long
    periods of time to startup. This was particularly a problem if the
    pending(persisted) event count was large as they all were rescheduled
    before the plugin finished initializing. Change this behavior so that
    startup merely begins the process of scheduling the pending events, but
    does not wait for them to complete.
    
    Bug: Issue 12769
    Change-Id: I224c2ce2a35f987af2343089b9bb00a7fcb7e3be
    
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