Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Remove LaaS Container build for RabbitMQ"
  - Remove LaaS Container build for RabbitMQ

    LaaS is using the upstream rabbitmq container now, so there is no need
    for this build.

    Change-Id: I08d2dc07eb6cd9cc732b25fd6dee2f342117d857
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 069baaa..5b994e4 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 069baaa55d95a047fe5af424cb61d50e0f204977
+Subproject commit 5b994e4f050c96ef8efafc265d967efb87e0522e