Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Conform with OpenStackUser.get_os_creds() in juju_epc"
  - Conform with OpenStackUser.get_os_creds() in juju_epc

    UserSettings are not linked to any project then abot has to be passed
    as arg when calling get_os_creds. Else it returns the project
    registered in credentials instead of the one created by this testcase.

    Change-Id: Ia0658cc9af155df06de3d14e21e5288dad6367f9
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>