Update git submodules

* Update docs/submodules/releng from branch 'master'
  to e0af39ff5937aa56c1e9c3af4b6589f4571316a9
  - Remove former docker build jobs

    Change-Id: Ie8dbca74cfb68eaa3610a14b81cb1f53d95dc399
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4fe72d3..e0af39f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4fe72d3acc00d372b2ab19239f24ddd2996366cf
+Subproject commit e0af39ff5937aa56c1e9c3af4b6589f4571316a9