Update git submodules

Update git submodules

* Update docs/submodules/vfc/nfvo/driver/vnfm/svnfm.git from branch 'master'
  to 857a00e8b6c47cb04284bc645985e91518bd6549
  - Merge "Migrate vfc-nfvo-driver-vnfm-svnfm docs"
  - Migrate vfc-nfvo-driver-vnfm-svnfm docs

    Merging this will create
    https://onap-vfc-nfvo-driver-vnfm-svnfm.readthedocs.io
    This build will run in parallel
    to the current docs generation method
    until we are ready to cut over.

    Issue-ID: CIMAN-364
    Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
    Change-Id: Ic347ecc42888d2a29830059a903d266e7f2213bc