Update git submodules

* Update plugins/replication from branch 'stable-2.16'
  to 84d96eb953d51c97b2093d06597bc69812b812e7
  - ReplicationIT: Remove unnecessary storage inspection
    
    Integration tests shouldn't need to rely on inspecting the underlying
    ReplicationTasksStorage layer(s). All of these tests already verify the
    expected end result.
    
    This leaves 4 tests that currently completely rely on inspecting the
    task storage to verify the expected result. Those tests need further
    improvement to decouple from the storage layer.
    
    Change-Id: I029d63ce7d07414d9bf5d9290d556378beedcabf
    
diff --git a/plugins/replication b/plugins/replication
index 5529649..84d96eb 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 5529649274286edbb7559a3af13724cdcb90f1c3
+Subproject commit 84d96eb953d51c97b2093d06597bc69812b812e7