Update git submodules

* Update docs/submodules/releng from branch 'master'
  to ecb22a34005d117f41d135be7aa7e6e209323939
  - Merge "Make node more explicit"
  - Make node more explicit

    lf-virtual1 -> xtesting
    xtesting -> xtestingci

    Change-Id: I3d22972bccfddeb1ca57e98b024de54b3c3479a8
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index bd49b8e..ecb22a3 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit bd49b8ed86f2afe25dd229fbc96e3f1b7fd938fd
+Subproject commit ecb22a34005d117f41d135be7aa7e6e209323939