Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[Dovetail] Setting correct process name for rabbitmq on Apex"
  - [Dovetail] Setting correct process name for rabbitmq on Apex

    Customizing the pod.yaml for running the dovetail.ha.rabbitmq test on
    Apex.

    Change-Id: I945d281bb8aac2799dd0ff0aa4a750cbf44803de
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2a32f9c..53c4bfe 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2a32f9cd7a843c6af8486f49a9d5833e5b6726c2
+Subproject commit 53c4bfef96008d3270c6a970de8b4afc6be7119d