Update git submodules

* Update docs/submodules/releng from branch 'master'
  to a22fe8f431881277dc57c03ed7ff7332ecba21ce
  - Leverage latest XtestingCI updates

    Change-Id: I8629bbe1b44d599c1278704264b10c6c27a216f1
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0fd55a4..a22fe8f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0fd55a49eebbb84d3dc8b4220483009774edaf07
+Subproject commit a22fe8f431881277dc57c03ed7ff7332ecba21ce