Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 04594c212a266bfc4702daef8272b4b8d8fb3973
  - Publish first Airship testing job

    It creates the multijob for testing Airship.
    It will be completed by the deployment part in a second step.

    Change-Id: I82389962dd51d737ced1012bb4cc805bd98f95b6
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7c6eae9..04594c2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7c6eae954b04794c735cd72316f98dd559cf60ca
+Subproject commit 04594c212a266bfc4702daef8272b4b8d8fb3973