Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Change Danube image for reporting

    to be sync with communication

    Change-Id: I7747416ab73f85d979d405afd9b87d57faac2bf0
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8258308..4825054 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8258308ce1b825de056aadb9d2b5e38f9558373a
+Subproject commit 48250544558d757f161dbb4f9cd3c45c2a3f6d8a