Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Revert "Avoid jenkins substitutions"

    This reverts commit 00431827b1a41f55fb700e69bfb229ccebc9c3f0.

    Change-Id: I77f0500b5e712745799dc9a7c7b94ce840e1f148
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 532d544..ff24d19 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 532d544beffedc438c6cc7f2f59d1880d05c779d
+Subproject commit ff24d1980c7bb39f38110c95ae5dbc08ac430cf3