Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 76279a668cb3e781e0eb1d9094aacf3f014f8a01
  - Debug xtesting2

    Change-Id: I86af5a419a00c21cb7f7dd3c4f8bf7f19cee47e9
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 69510ec..76279a6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 69510ecba696f3dea0a826aef6fee72044a61365
+Subproject commit 76279a668cb3e781e0eb1d9094aacf3f014f8a01