Update git submodules
Update git submodules

* Update plugins/replication from branch 'master'
  to e3cc87b88c6a64966a411b8a0a4caad3ebad539b
  - Merge branch 'stable-3.1'
    
    * stable-3.1:
      Add method to push changes directly to given replica
    
    Change-Id: Ia696a15a5b56d6c059915f61f15d85aa744110f9
    
  - Merge branch 'stable-3.0' into stable-3.1
    
    * stable-3.0:
      Add method to push changes directly to given replica
    
    The commit "Add method to push changes directly to given replica" is
    omitted in this merge due to conflicts with refactoring that has been
    done in stable-3.1. If this feature is needed later it will be redone
    in a new commit.
    
    Change-Id: Iab801b94f029bffe393a30fb33eea50fc755affe
    
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      Add method to push changes directly to given replica
    
    Adapt the hereby merged UsedAt import addition to the c.g.g.common
    package, differing from downstream c.g.g.server.
    
    Change-Id: Ib630eb2be5a1167fddb949ee464b35bcf3f8db05
    
  - Add method to push changes directly to given replica
    
    This makes it possible to push changes directly to given replica
    instance without sending unnecessary requests to others.
    
    The method is intended to be used by other plugins that extend the
    replication plugin.
    
    Change-Id: Ib3e5a6c3afde834855d055b31beb43a560f8d785
    Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
    
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