Update git submodules

* Update plugins/replication from branch 'stable-3.0'
  to f9c6f8d875bb44fd636011dc8c16308b57d90dd1
  - Avoid double slash in REST calls made from the GerritRestApi
    
    Change-Id: I2742411bc801e113e487bf5c9cbb26ede35d2bd5
    
diff --git a/plugins/replication b/plugins/replication
index 1c82d0a..f9c6f8d 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 1c82d0a26c43eefd1f37c1428e92ca80ea9a8be0
+Subproject commit f9c6f8d875bb44fd636011dc8c16308b57d90dd1