Update git submodules

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

    JIRA: RELENG-254

    Change-Id: Idc05b81ebf8636a5d422e54b72ee58c039b1843c
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index aca0689..c121767 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit aca06893311c0b7969441b820f87d671696085e0
+Subproject commit c1217677631cd8da04a17af3d0731f7351da551c