Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Update to stable/queens

    It allows getting first results before the blackout between MS0 and
    MS2.1. Testcases could work thanks to backward compatibility provided
    by openstack clients.

    It disables all features which are not synced (patches are under
    review).

    It will ease verifying installers which are following master because
    it reduces the gap between releases.

    Change-Id: If0893f6dbaed76d4bafbd10a4f0934e6c5057477
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 820c4c5..478d483 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 820c4c5c313a848f872ecc0416af1ec65a2a46bb
+Subproject commit 478d4832d135479695f8a13c220d682da85c818f