Update git submodules

* Update docs/submodules/releng from branch 'master'
  to af7e8e379cb404c05c9453f78d88e4f74c07deb8
  - Remove security-opt seccomp=unconfined

    Change-Id: I3b67ba0e7d3b9b36d2b7b681d52a2ea8938a5891
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 22f1a34..af7e8e3 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 22f1a3476e9de9c6006e0f45091ff7d389219820
+Subproject commit af7e8e379cb404c05c9453f78d88e4f74c07deb8