Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "change rabbitmq-server to rabbitmq for all installers"
  - change rabbitmq-server to rabbitmq for all installers

    From the CI results, ha.tc010 can't find the process named rabbitmq-server
    for Apex, Compass and Fuel.
    Try to change it to be rabbitmq.

    Change-Id: Ibf8a9e1c7eeebbc306624fe926c139786b9833fb
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 739c2d9..ea7d014 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 739c2d9550e34798e31fc4931b9f1afc0a582827
+Subproject commit ea7d014482095a24bb1ac06ae3ca866ebc15ae2b