Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-2.15'
  to 0df288afccb53b7abbe4f2ee90f68c80e9dcd2c7
  - ReplicationFileBasedConfig: Fix setting default sshConnectionTimeout
    
    The default value did not get set when the replication config did not
    exist, was empty, or was invalid. This is not really a problem since
    if there is no config, no SSH connections are made anyway.
    
    A more serious issue is that the value was read with minutes as the
    default time unit, but then converted to milliseconds using seconds as
    the time unit, which resulted in an incorrect value.
    
    Change-Id: I64906e29acb56f0f53b432db61d2707dfe1963d3
    
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