Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 7f911165c5a504ef411670bd80470dc65ae125b0
  - Use the right .kube

    Xtesting now use xtesting user

    Change-Id: I19024d1aa573ed2e1aa5b9207f7dfbe03389c798
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d77fe9f..7f91116 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d77fe9f7d2e3898fabf77872da3bda419ff881fc
+Subproject commit 7f911165c5a504ef411670bd80470dc65ae125b0