Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Fix the haproxy service and gnocchi db sync problem

    This patch reflects the fix Tianwei found for the keystone and gnocchi
    issues with HA deployment.

    https://gerrit.opnfv.org/gerrit/#/c/32367/

    The keystone issue should be fixed upstream but until that happens, we
    can use the patch here to move us forward.

    Previously removed OpenStack services have also been enabled to
    try as close deployment as possible to upstream openstack-ansible.

    Change-Id: Ib7b1cfe0f363381466b43a3249667c638c09d9fd
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 85ec79c..fab7298 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 85ec79c7b6ac21c0d8e6a2910246c2d5d38ad981
+Subproject commit fab7298b91aff6bc262cb4b086e381b38e8af984