Update git submodules

* Update plugins/replication from branch 'stable-3.8'
  to 0ef3c3437366b126c5e04f76a4fc47932bf4e8ca
  - PushOne: Remove unused addRef() method
    
    This is only used by tests and should have been removed when
    addRefBatch() superseded it.
    
    Change-Id: If9de1df29fd56a595fa4d4b2b4f5716264a67e11
    Release-Notes: skip
    
diff --git a/plugins/replication b/plugins/replication
index 8fd3c27..0ef3c34 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 8fd3c271ce0a21480e3d04da5ad2112efea3bedf
+Subproject commit 0ef3c3437366b126c5e04f76a4fc47932bf4e8ca