Update git submodules
Update git submodules

* Update plugins/replication from branch 'master'
  to ab6af46f5d191c10a163f4d8a77b75e920bde372
  - Merge branch 'stable-3.1'
    
    * stable-3.1:
      Do not remove replication tasks if they are retrying
    
    Change-Id: I5cbdcd29541f6d88fe93364cc4769b93123138b5
    
  - Do not remove replication tasks if they are retrying
    
    Prevent the premature removal of replication tasks when they
    are scheduled for retry. The termination of a PushOp does not
    necessarily mean that the operation was successful or was definitely
    cancelled: there is also the possibility of retrying upon failures.
    
    Fix an issue where the replication task storage was attempting
    to remove the persistent task and, luckily, failing because the
    task was put back into the waiting queue.
    
    Bug: Issue 12073
    Change-Id: I4751f427aa1c45a8a36232d74e0a6691f860e490
    
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