Update git submodules

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

    JIRA: RELENG-254

    Change-Id: I07318b8077d46e5d716f0ac42453ab999e5c76d9
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b771431..18ee6ba 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b771431b199906fe65c56155c9cb5d5e1a638726
+Subproject commit 18ee6ba177e399d5f6e54c8454e88a0a2f06d183