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

If ovs port is virtual, we use OVSIntPort to create it.
Otherwise it should be OVSPort.
I've added new key: ovs_port_type to not intersect with current
deployments and not hurt anyone.

I've updated doc to have an example of ovs peering patch.
Customer-Found

Change-Id: Ieddb5fcc02d410c3cc14c89737992690cb5f3975

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