Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 16f6b169131eceb9967c7783665c3f157ae21978
  - Add debugs in Functest K8s jjbs

    It conforms with Functest OS jjbs which redirects to /dev/stdout.

    Change-Id: If6517f52d72f7d436eb7e2bd3ef29179daef24dc
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a15c6cb..16f6b16 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a15c6cb8fc93125d025a462c40b9961bb969e9ec
+Subproject commit 16f6b169131eceb9967c7783665c3f157ae21978