Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Fully remove CreateInstanceSingleNetworkTests

    It's linked to a specific configuration on purpose which doesn't meet
    all OpenStack deployments [1].

    JIRA: SNAPS-322

    Change-Id: I372f8ed56600e1846383d1da76720a0d3783e901
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e775d24..444c9a7 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e775d24a84676092058684beac1a51be26f86028
+Subproject commit 444c9a7dcacee0624422093cf58926cbc6f59b18