Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-3.1'
  to 5e3cbc8e7e45172790e777ec0576b08b65934b09
  - Remove unused private methods
    
    Change-Id: Ibad18b68f471bfb2e6fadaf1455993aa2d382d9d
    
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