Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Update scenario section in tempest.conf

    It's required at least by Barbican tempest plugin.

    Change-Id: I46a65ee5fee044917c5375adaa8ebb529efe86ec
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index fbb0d16..9ec6395 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit fbb0d16e9ccec7f2b543906ff13801d802fecc3f
+Subproject commit 9ec639526ed32d4b05168627c5c016fb66b7d008