Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-3.1'
  to 2fbc9a44324fc2cfc4f4ba6e916a3c487f997216
  - Merge branch 'stable-3.0' into stable-3.1
    
    * stable-3.0:
      Make SecureCredentialsFactory public
    
    Change-Id: I4dfd9e37da5e67ee7efb4a2657da014e9d35bbc0
    
  - Make SecureCredentialsFactory public
    
    This allows it to be used in implementations that extend the
    replication plugin.
    
    Change-Id: Id81f5986f24720b9575c1987c21b2ae9672ddd37
    
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