Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Gate Functest tests when +2

    It will update to Workflow as soon as possible.

    Change-Id: Id12afa6836b4cc0129666480eb92c36132c32823
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c876505..ce7ab72 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c8765055df82461e9210706d04f4a8d09a440d68
+Subproject commit ce7ab72c78031b0f7eddec9291152b59c5a534f5