Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 09b56602efe05a442d3469697cf07c876774ed04
  - Tag Xtesting

    Change-Id: I1a6046ecc107f35d274872e95634c36e886301eb
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ae459ae..09b5660 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ae459ae52250ef92344efec418d8d30b518d57c1
+Subproject commit 09b56602efe05a442d3469697cf07c876774ed04