Update git submodules
Update git submodules

* Update plugins/replication from branch 'master'
  - Merge branch 'stable-2.15'
    
    * stable-2.15:
      Document which branches must be replicated to replicate the account data
    
    Change-Id: Ic4d1fdc228fd1c5c2da51a8f816ff796f9bfb26e
    
  - Document which branches must be replicated to replicate the account data
    
    Change-Id: I2c9dc06927cd8e9e541eb032829029bdfac8db6e
    Signed-off-by: Edwin Kempin <ekempin@google.com>
    (cherry picked from commit 93ab1609a4ba32e9466ff0649317b84a211285ad)
    
  - Document which branches must be replicated to replicate the account data
    
    Change-Id: I2c9dc06927cd8e9e541eb032829029bdfac8db6e
    Signed-off-by: Edwin Kempin <ekempin@google.com>
    
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