Update git submodules

* Update plugins/replication from branch 'master'
  to 51750cae8ba3c68bcefedbe8b05faabf9ea5ada4
  - Create persistent task files safely
    
    Use a temporary directory to create the files in first to avoid
    partially written files being exposed in the waiting directory.
    
    Change-Id: I82222e16b52926ced304cb24eadd1c8d56cf9a7a
    
diff --git a/plugins/replication b/plugins/replication
index 48ff6f3..51750ca 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 48ff6f398941572243a0fd7aa26e07d6c95696a1
+Subproject commit 51750cae8ba3c68bcefedbe8b05faabf9ea5ada4