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>

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