Update replication plugin to latest revision

- Change metric to replication_latency

Change-Id: I7b0a4d3a14d598075cf4414971294406b300dc5e

plugins/replication

diff --git a/plugins/replication b/plugins/replication
index 7782b74..168032c 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 7782b7403d043c144d41a01db2331665983a5f70
+Subproject commit 168032cb1efadb83db5da4fd0060c94c9e05ccfa