Update git submodules

Update git submodules

* Update docs/submodules/sfc from branch 'stable/fraser'
  - Changing README

    Change-Id: Ia2112794ef542ff91af1a547d814a0f0c737dd54
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    (cherry picked from commit 10065e1a4fc60ab31ac166745a11cb08b47ac8db)

  - Use different config files depending on version

    We can read the openstack version from the env variables and then use
    a different config. The reason we use this is because openstack API
    changed from Pike to Queens and Pike is the official version for
    OPNFV Fraser release

    Change-Id: I8a94e71224d2ba0aa75a6438f3d7b03929acbbef
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    (cherry picked from commit a459dee88ba00d6f8283232ce2159594ae23d22a)

  - Merge "Update symmetric chain test case" into stable/fraser
  - Update symmetric chain test case

    Update the symmetric chain test case aligning it with updates available
    from ODL Oxygen:

    - ODL networking-sfc implementation now supports symmetric paths. It is
      no longer needed to configure the ACL or chain directly through the
      ODL rest api. It can now be fully relied on tacker for this.
    - ODL networking-sfc implementation now supports different ingress and
      egress ports for port pairs. The test case exercises this by setting
      up a VNF with two distinct ports. Note that this requires an updated
      VNF image that supports two nics and bundles a vxlan_tool capable of
      using them.

    Change-Id: Ie711abb93109943dcbf699ece7b2b570500a3711
    Signed-off-by: Jaime Caamaño Ruiz <jcaamano@suse.com>
    (cherry picked from commit 8e85daee26c523cd181f5884858646b7589c50af)

  - Support sfp redirect action on acl flow check

    Starting Oxygen, ODL networking-sfc translator supports symmetric
    paths and maps flow classifiers to ACLs with SFP redirect action
    instead of RSP redirect action. A SFP may have two RSPs associated
    if the path is symmetric, one otherwise. One of the two RSPs will
    be flagged as the reverse path and the other is the forward path.
    Traffic from the logical-source-port will be classified to the forward
    path, while traffic from the logical-destination-port will be
    classified to the reverse path.

    This patch updates the ACL flow check logic to account for the above.

    Change-Id: I2d8b9e6c2a1033d469668db29b9c18f525e89370
    Signed-off-by: Jaime Caamaño Ruiz <jcaamano@suse.com>
    (cherry picked from commit f66a8164cfb2ef172ee3ea274992b9c07306f08c)

  - Fix flake8 problems

    There was a bug in releng and pylint was not ran, some issues got merged
    in master because of that

    Change-Id: Icf3fa882f4f2b0593fa0b85edce46e49dcc303c9
    Signed-off-by: Manuel Buil <mbuil@suse.com>