Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 69510ecba696f3dea0a826aef6fee72044a61365
  - Debug xtesting

    Change-Id: I6763e8ab343335b487f8e84d14a08a8d4e54cca0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index feebb3d..69510ec 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit feebb3d6fb57f7bd9856a593bb638febdb2992ac
+Subproject commit 69510ecba696f3dea0a826aef6fee72044a61365