Update git submodules

* Update docs/submodules/releng from branch 'master'
  to ccc892ebc41301cfe75c3d669e125f155b7b0ab5
  - Leverage the right Functest Xena gates

    Change-Id: I76d16d036db424ff779d581ab7fb1b18694e9a59
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index fc29e71..ccc892e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit fc29e71adbed054b577addba5df7ef269342bca3
+Subproject commit ccc892ebc41301cfe75c3d669e125f155b7b0ab5