OpenContrail + Ironic integration

Ironic is an OpenStack project which orchestrates baremetal deployments. It utilizes Nova API to deploy user images on baremetal servers. In NBewton release of OpenStack Ironic implemented mulitenancy use-case with Neutron (https://specs.openstack.org/openstack/ironic-specs/specs/7.0/ironic-ml2-integration.html). Ironic stores and provides to Neutron connectivity information of Baremetal Server, Neutron ML2 plugins configure ToRs by using that info.

OpenContrail is a popular neutron backend and it already have support of ovsdb managed switches. We need to handle connectivity fields provided by Ironic on contrail side to implement multitenancy use-case with Ironic.

This blue print is implemented with the following bugId:
https://bugs.launchpad.net/juniperopenstack/+bug/1683547