Update git submodules

* Update plugins/replication from branch 'master'
  to 6673becb41c774b1063e4b18c1821ced049fee2e
  - No longer use an extra thread to schedule pending events
    
    Move processing of pending events to the defaultQueue in a non invasive
    way so that this processing should not interfere with other important
    tasks in the queue for longer than it takes to process a single entry.
    This is achieved by using a new ChainedScheduler class which breaks the
    workload up into small pieces with their own task each, and only places
    a new task in the queue each time a task begins execution. This creates
    a natural load based throttling which can execute fast when there is no
    load in the executor, but mostly gets out of the way when load is high.
    
    This move also avoids delaying plugin startup until all the pending
    events are read from disk. This allows new replication events being
    created on the server to be scheduled before all pending events have
    been scheduled which results in a slight priority boost for new events
    over pending events.
    
    Change-Id: Icddf88b85dec9078bb4a7923b9211614989978ff
    
diff --git a/plugins/replication b/plugins/replication
index db37fc8..6673bec 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit db37fc805c157112266572ee55efa407afeddff7
+Subproject commit 6673becb41c774b1063e4b18c1821ced049fee2e