Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 06bd9b521dd002c50de27d2ddcb55897a0f03597
  - Exclude security and cnf dockers if not latest

    Change-Id: Id0c3fb9581f3c4614b4a6480cb119eb39c5ebe9e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cae51b8..06bd9b5 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cae51b8b59d42c6a9568e0714f7371ad14c4855a
+Subproject commit 06bd9b521dd002c50de27d2ddcb55897a0f03597