Update git submodules
Update git submodules

* Update plugins/replication from branch 'master'
  to 5a5175280743ce3da0e6267a1f04db55bbc7c779
  - Allow to parse stored replication tasks using the "ref" key
    
    Before change Ic0534d03dee6759ba4cb6b19ae87fd75269b437b a single
    ref was stored per task using the "ref" key. The above change changed
    it to the key name "refs", that had an array of refs as a value.
    This led to issues, when tasks with the old format were still
    present, when the change was applied.
    
    Now, the old "ref" key is supported again and will be parsed correctly.
    
    Bug: Issue 15922
    Change-Id: I907109d0581ffa01781603741f4271471b19d71d
    
  - Fail if an unknown field is found in the stored replication task
    
    The Typeadapter that reads the stored replication task could end
    up in an endless loop, if an unknown field is present in the stored
    json string.
    
    Bug: Issue 15922
    Change-Id: Ib518a8ac10eb178ea2dd50767377f57080fc8411
    
  - Move tests for RefUpdateTypeAdapter to proper class
    
    Change-Id: I7edc32411aa2876c2fcd46f120c523a3e7ba2765
    
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