Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 5e2111831d34e68667f14858eb41edb7add00234
  - Add docker-scan in Functest images

    Change-Id: I56158b92f917410dab4113590613e230d87d122d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0b8e9b8..5e21118 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0b8e9b8ba5adaf70cc2de6e5e09849b5e2422e93
+Subproject commit 5e2111831d34e68667f14858eb41edb7add00234