Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Stop running containers in privileged mode

    It should be useless in case of Functest.

    Change-Id: Iac214dc484079bf17bbbfc08c28554835fac3f69
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cd9e04c..cdb531a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cd9e04c5c9934c8dfb58cda74638bef3a12a1163
+Subproject commit cdb531a95854fdbadc81ddbbf927c8c1fe904cae