Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Generate functest-kubernetes.yaml via collivier.xtesting

    Change-Id: I30a504fbf052d5ce24a470e3c255fc33d1df65d8
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3be3642..164348f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3be3642cbb71478feda07e2f2f29b9b3462ec2c6
+Subproject commit 164348fd056a801b5543c110a14650a9c8449793