Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Set docker_args as expected by functest-virtual

    Change-Id: Ia30c5bc380898f8bacb32c74b19092faf504bfbb
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3a5ccbb..29e7d69 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3a5ccbb6ea410517d013e269bb7aa9d28fdfb0cf
+Subproject commit 29e7d692856dea7cc95fed2e145f79f837305df7