Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Fix Yamllint Violations for jjb/ovn4nfv"
  - Fix Yamllint Violations for jjb/ovn4nfv

    JIRA: RELENG-254

    Change-Id: If3c2d8b469c97997a3fdcbcaf4750acb61c82d75
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c7ff4f0..39b7e05 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c7ff4f017560491abecaa909ffe622fc9bf283b1
+Subproject commit 39b7e0578fadf755fc1f57996818bfa181aae11b