Update git submodules

Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Stop relying on internal Functest utils

    It switches from functest_utils.get_functest_config() to
    config.CONF(). download_url is now hosted in sfc as it's unused by
    Functest.

    ft_utils.get_parameter_from_yaml() will be considered as part of
    Functest framework (then it must be well covered and documented).

    Change-Id: I3014d90dba53422020ae85a2815c5bf8c0dcf34c
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>