Update git submodules

Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Add ceilometer to the scenario

    Due to the n-odl dependency, ceilometer must be part of the scenario.

    There is a chicken-egg problem with this patch. There is a XCI patch
    which will not get a +1 from jenkins if this patch does not get merged.
    However, this patch will not get a +1 from jenkins unless XCI patch
    gets merged. This is XCI's patch:

    https://gerrit.opnfv.org/gerrit/#/c/62419/

    Change-Id: I145ac35dcb94d40f6e21a1a49ae5a1e754434a10
    Signed-off-by: Manuel Buil <mbuil@suse.com>