Update git submodules

Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Track the indirectly created security groups

    networking-odl creates a security group when creating a router. This
    security group is not tracked by SNAPs and thus it never gets removed
    when running the clean up. We need this workaround until the following
    bug is fixed:

    https://bugs.launchpad.net/networking-odl/+bug/1763705

    Change-Id: I15b939609e815f24ef0c1dcc0aeb9f4471f351f0
    Signed-off-by: Manuel Buil <mbuil@suse.com>