Update git submodules

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

    JIRA: RELENG-254

    Change-Id: I348cd559349b73ce9bba44b66c843a1b72ea4ff9
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index be337be..78a8256 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit be337bec1bcda01cd32b51868a8b031ecb217536
+Subproject commit 78a82560cc02ca25b6cf8e642203168950c9255d