Update git submodules

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

    JIRA: RELENG-254

    Change-Id: I354d7064c560d4b23e361d556b7fe269d7fb5d26
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index dc99f96..662a7b5 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit dc99f96c8b7d29916b5e40ace92f929c2b631798
+Subproject commit 662a7b5ebe60f00263571a14fbe73d045964d79d