Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-3.3'
  to 0e34c23c9d733cf1761e2d288380e606eca9bb32
  - ReplicationTasksStorage: Handle empty task files
    
    Instead of NPEing if we manage to read a task file that's empty, return
    an empty Optional.
    
    Running the IT tests 1000 times produced this as the only failure (and
    only once).
    
    Change-Id: I3e7392dfb179795348d7f4a207102aa867aed85b
    
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