Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-3.1'
  to 5019d29de075b90e66762b2b27909da14ed01293
  - ReplicationConfig: Add missing JavaDoc
    
    Change-Id: I25b1044e3cb650b5eb999cfdf4720c0ccaf160b9
    
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