Update git submodules

Update git submodules

* Update docs/submodules/sfc from branch 'stable/euphrates'
  - Remove SFs from security groups

    Having the SFs port in security groups delays packets artifically in the tests
    Besides, the netvirt guys suggested not to do it because it might be confusing
    for ODL in some situations and it is not a 'suitable construct'

    Tests without security groups show indeed a better behaviour

    Change-Id: I33281215cd2e80804c8f09ca201c046f590249ab
    Signed-off-by: Manuel Buil <mbuil@suse.com>