Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 19b9c7a165c39f186dbc52ef2e27083dbb1a63f1
  - Stream must be broadcasted

    Change-Id: Ia810e463584cc876f4a53cd8ac31a1a1fb91d8e0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8367978..19b9c7a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8367978a1fc7ba6d4be93c02b63542599770f2a5
+Subproject commit 19b9c7a165c39f186dbc52ef2e27083dbb1a63f1