Update git submodules

* Update docs/submodules/releng from branch 'master'
  to cd0bbe31652c8e73b526dd4f063f519ea075a76f
  - Clone Functest repo before running tox

    Change-Id: I5df766d5ce87b680c5b2c8602a86b117f7063c74
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 502e0f5..cd0bbe3 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 502e0f5fbe1925c79ecc52175f1aac342b53d7fb
+Subproject commit cd0bbe31652c8e73b526dd4f063f519ea075a76f