Update git submodules
Update git submodules

* Update plugins/replication from branch 'master'
  to 94a465e0989ff8124aca3dca8e200aeb870cc9dd
  - Merge "Decouple observable queue implementation from ReplicationQueue"
  - Decouple observable queue implementation from ReplicationQueue
    
    Prior to this change, AutoReloadRunnable used to depend on
    ReplicationQueue, which was used just to observe the status of the queue
    during the run() phase of the reloading.
    
    Decouple reloading of configuration from specific queue implementations
    by depending only on a way to observe the queue, rather than the queue
    itself.
    
    Incidentally, allow AutoReloadRunnable to be reused by implementations
    that use a different queueing systems, or no queuing at all, such
    as the pull-replication.
    
    Change-Id: I589c5bf3fb49a53734ba3a991d08db33bc189d3e
    
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