Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "fix yamllint config file"
  - fix yamllint config file

    pick from https://gerrit.opnfv.org/gerrit/#/c/50737

    Change-Id: If5b83c656f33af1740df194ba826b6a31ac10355
    Signed-off-by: Ryota MIBU <r-mibu@cq.jp.nec.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 28f5465..49dcb03 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 28f546569dbad964b6b1525821b65e22db1b0e3d
+Subproject commit 49dcb03d819213b350674342c310317be3e59d65