Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Fix Yamllint violations for jjb/daisy4nfv"
  - Fix Yamllint violations for jjb/daisy4nfv

    JIRA: RELENG-254

    Change-Id: I71f2879dd04cc56dc8023fc7163871e94de78eb6
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index bfc9261..4571595 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit bfc9261538b93578e64c54f9daf0d0d9758d0dec
+Subproject commit 4571595d1a6a9a46b53e13c0b04ab20cb132c55d