Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 727f44d46f878278cfecbd1362db69f1b474ceb3
  - Rewrite Xtesting verification job

    It deeply simplifies the overall logic and prepare a possible next
    integration in the gate multijobs

    Change-Id: I8f7639706df15b7f3d1ca1dfac9296cfc3832bac
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cd0bbe3..727f44d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cd0bbe31652c8e73b526dd4f063f519ea075a76f
+Subproject commit 727f44d46f878278cfecbd1362db69f1b474ceb3