[RFE] OpenContrail + Ironic integration

[Vasyl Saienko]

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.