Update git submodules

* Update docs/submodules/releng from branch 'master'
  to ec1047957684335b4aee24ba787796217c0f6f5c
  - Replace slave by node

    Change-Id: I5bc99f0d1b3b97a784c48f5a4541262786a365f5
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 25459ea..ec10479 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 25459eafff7d014cd2ccf1323acd2f00657981ef
+Subproject commit ec1047957684335b4aee24ba787796217c0f6f5c