Update git submodules

Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Add post-provision playbook to pass ml2_conf.ini

    Functest requires ODL variables to run the ODL healthcheck which is
    mandatory for all ODL scenarios

    Jenkins CI jobs will fail because it requires this patch to be finished:

    https://gerrit.opnfv.org/gerrit/#/c/63175/

    which requires this one to work (unfortunately, circular dependency)

    Change-Id: I960e3346d840c5e30a2b56284fe109b8f99046e3
    Signed-off-by: Manuel Buil <mbuil@suse.com>