Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 844e9a86d6f4114f228c7b70ddf26c25e952dac5
  - Fix DASHBOARD_URL if Xena Gates

    Change-Id: I20c40953a2a596a7c18f5e7a63c242aded9c2d32
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ccc892e..844e9a8 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ccc892ebc41301cfe75c3d669e125f155b7b0ab5
+Subproject commit 844e9a86d6f4114f228c7b70ddf26c25e952dac5