Update git submodules

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

    JIRA: RELENG-254

    Change-Id: Ibfda27a637ee448862ae2df5884b88093210ed4d
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5c40041..c7ff4f0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5c40041fcf8fefdeded0ff547b481f60d033c8a8
+Subproject commit c7ff4f017560491abecaa909ffe622fc9bf283b1