Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 90b3511453a9a7254cde80d382091908d956d054
  - Use the right project as url suffix

    It replaces xtesting by airship and cntt.

    Change-Id: Id201abd6601045552724f26706f2e6d23f02f9ba
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 719f539..90b3511 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 719f539c4ac8718c7428ec964112a533aa63e737
+Subproject commit 90b3511453a9a7254cde80d382091908d956d054