Update git submodules

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

    JIRA: RELENG-254

    Change-Id: Iaf58cc822eb616711c0dc081f5b0154fe881646c
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a3d6c79..335d549 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a3d6c7940218d0bb57840deb26d34959851e4e37
+Subproject commit 335d54976c2d9330b7377c0dd07f06d0d78fbf80