Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Final Yamllint Fixes"
  - Final Yamllint Fixes

    Fixes some final yamllint issues introduced by recent patchsets in apex
    and armband.

    JIRA: RELENG-254

    Change-Id: I26b45d737f06c215413e29c92031d14e23967506
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7ff50f9..447897b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7ff50f9dcd6d62bb48c1b988edf19884a5fc76c8
+Subproject commit 447897b45c69e881db36cf7f4d5a4a45350d1e37