Update git submodules

Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Remove side_effect method in 'test_cleanup.py' module

    The side_effect method under test_delete_openstack_objects_exception
    method in 'test_cleanup.py' module is not needed. In fact, it won't
    be called at all. It should have been detected in [pylint] W0612.
    So when we run the nosetest, side_effect from Mock instances of
    mock_creator_obj_one and mock_creator_obj_two were called.

    Change-Id: Ibad6c8ebe14c320ef31c2133635ecd45fd011835
    Signed-off-by: Venkata Harshavardhan Reddy Allu <venkataharshavardhan_ven@srmuniv.edu.in>