Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 0141ae9141d5678fe2cd99906e953c5a80afecc6
  - Call docker system prune

    Change-Id: I7d0ec02e31f54a64c6cd94d12a9d124aac95d536
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d24f28c..0141ae9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d24f28c142db7ab4bfd6a5bc000c76e85ae2994a
+Subproject commit 0141ae9141d5678fe2cd99906e953c5a80afecc6