Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 013437a9a18a357e44e3ad65555eb742b8cabeb9
  - Clone submodules too

    Change-Id: I03404e9ebf53592873d5eedbcf8f7ef3e72c2953
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2ed8a02..013437a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2ed8a02d2e7ff3dd122a14b60530fdc7f6378ed9
+Subproject commit 013437a9a18a357e44e3ad65555eb742b8cabeb9