Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 630a1c5204f4985656f8590b9e99ac4abcaa5477
  - Try LaaS via leguer gates

    Change-Id: I684f50846c4be523b684ddeb1a750a989531819f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d6bb3fe..630a1c5 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d6bb3fe8574bf5acd790339aaf1a7fb3c8cd7d31
+Subproject commit 630a1c5204f4985656f8590b9e99ac4abcaa5477