Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Stop creating network resources in tempest

    fixed_network_name is not used in neutron or nova gates [1].
    It may bypass juju bug (subnet discovery).

    [1] http://logs.openstack.org/46/603046/1/check/tempest-full/a8468a1/controller/logs/tempest_conf.txt

    Change-Id: I820e8c723918ed683ed1f8016363eb70bad0d14a
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 7236c6b..ac31a32 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 7236c6b9173550ecb8419eccfd053e7b44b2d379
+Subproject commit ac31a32320122ea1683fe9884e5bf1f969678b03