Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Adjust and fix jobs and scripts

    This change
    - fixes GIT_BASE in jobs
    - adjusts build blockers
    - fixes where the flavor vars should be sourced from
    - sources flavor vars for bifrost periodic jobs
    - renames the xcimaster node to opnfv to be consistent
    - removes obsolete xci-provision.sh script
    - enable additional openstack services including tempest to
      ensure the deployment is sane

    Change-Id: Ifdce1da52d68a26c2b87e1bd3b1996ec119d8d90
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 908d962..a5a7e0f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 908d962bedf027631bc0209c4d2c06830d6c8659
+Subproject commit a5a7e0f1f133aa64c62f7f34cb4f972a20b9a6f8