Bring in "tag" option for dpdk/ovs bridges
to support vlan-tagged vxlan mode.

Change-Id: I7f1f88233694f2c8b968a6cf55584f32879ec042

Currently when OVS-DPDK is enabled, instances fail to spawn
due to permissions mismatch, see nova bug for details:
https://bugs.launchpad.net/nova/+bug/1670950

This patch configures OVS to use a separate dir, created by
nova formula [1].

[1] https://gerrit.mcp.mirantis.net/11213

Related-PROD: PROD-14413

Change-Id: Ia86658b0967b4d35f063c7f6f53e26e78a1fbd39

Current logic does not apply n_rxq, pmd_rxq_affinity and mtu
for a dpdk port in case it is attached directly to a bridge
(not bonded).
This patch makes formula apply parameters in both cases.

Change-Id: I5b19999b1ac8a80d1e31b266fede7dad0d7fd0d4

Change-Id: Iec857e4ac374b7787892144c772063796be87c4b

This enables a more fine tuned dpdk for better performance.
More details on pmd-rxq-affinity config:
http://docs.openvswitch.org/en/latest/howto/dpdk/

Change-Id: I630c6af94ff733619fb175f522fc515984862ff6

Add possiblity to add ip address and mtu on dpdk ovs bridge to
be able use VXLAN as tenant segmentation.

Change-Id: I1394d30c5d9935218841b17ff7651dac7b4abefa
Epic: PROD-8957

Introduce dpdk support for linux OVS configuration.
It configures dpdk interface bind, ovs dpdk ports, bonding,
parameters for dpdk cpu pmd and set multique queues for specific
ovs dpdk interfaces.

Change-Id: I3f38660bab8db0c2b38f03ed8c94eb10b6b3beb9
Epic: PROD-8957
Epic: PROD-8958