Update git submodules

* Update plugins/replication from branch 'master'
  - Add ReplicationScheduledEvent to indicate ref replication is scheduled.
    
    Assure that event is posted only once each time a ref is scheduled.
    Covers the corner case when the ref is added to already scheduled push.
    
    Change-Id: I175940f8d4c6b9164c41bbec8c52d221ec30001b
    Signed-off-by: Eryk Szymanski <eryksz@gmail.com>
    
diff --git a/plugins/replication b/plugins/replication
index 531ed17..bb1ee89 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 531ed177aaab613c5830b7578df2dd4d84a7f319
+Subproject commit bb1ee89bdf6bdd2dfdf5d16a11a18b077c7c523d