Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Create a second user in cloudify_vrouter

    It mainly bypasses a bug when a similar network name has already been
    created.

    We can't apply the same operations for cloudify_vims because the key
    must be created by the _member_ user.
    Snaps haven't allowed that since [1] has been merged

    [1] https://gerrit.opnfv.org/gerrit/#/c/52157/

    Change-Id: I90131487d0e08a4d95c684efb16a8009c3709a8e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 78a2110..8ca868e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 78a21107e377f4f4722fd8d570dc0394f6ae5692
+Subproject commit 8ca868e6a71520d151a405f01e4a5a77973b4956