Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Set user domain name when creating users

    It updates juju_epc.py and cloudify_vrouter.py.

    Change-Id: I8cf97e31d78a4d48ad815faadc8e4130581e1c21
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 661fed2..b28bbe4 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 661fed2fa81d70e145ce5290d243ab523d3d7fc1
+Subproject commit b28bbe423d3daa56be6342002e4e91639df15d17