Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "jjb: xci: bifrost-verify-jobs: Disable OPNFV bifrost jobs"
  - jjb: xci: bifrost-verify-jobs: Disable OPNFV bifrost jobs

    The jobs are unmaintained and broken for months. Upstream already has
    jobs for all 3 distributions so there is little value to test a similar
    scenario on the OPNFV side. As such, lets disable them and save some
    hardware resources for XCI.

    Change-Id: I0ab7d51f44bdeb6f630671e8d05dd2baf67d756c
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8d84d7d..5081dfa 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8d84d7d9ac290135804b8ab3f5506e175db8d29e
+Subproject commit 5081dfa0afcf464c1a26cf2f68ebde76373165cb