Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 47390f81d7138b5ef9bba50e6cfbc1e65e0c37cd
  - Take last arm container into account

    Change-Id: I8477036ee299487600d7a21574bce8912bc9e415
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0c37a67..47390f8 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0c37a675a3df3dc3091c7bd27a270b3bfc403f71
+Subproject commit 47390f81d7138b5ef9bba50e6cfbc1e65e0c37cd