Update git submodules

* Update plugins/replication from branch 'stable-2.16'
  to 3e97cd967fc9a6413ae4265a4d7cb45a3730463a
  - Pretty-print stored ref-updates for replication
    
    Allow having a more understandable printing of the stored
    ref-update events when printed in the logs.
    
    Change-Id: I8d7fd1bfb89a1ff39d89395aace7c473bb3004ed
    
  - Remove obsolete warning about events cancellation
    
    Now that replication events are persisted across restarts
    the warning of cancellation is obsolete and misleading.
    
    Change-Id: Ia5e2205ae3b8779a6741541c7003f2f47c8e3fce
    
diff --git a/plugins/replication b/plugins/replication
index fe4162b..3e97cd9 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit fe4162b8c38d2a817a98effd0748d045872edef7
+Subproject commit 3e97cd967fc9a6413ae4265a4d7cb45a3730463a