Add ironic-based baremetal model example

- add a model mk24_lab_ovs_dvr_vlan_bm with ironic-based underlay
  (this model is not updated to the latest mcp1.1 changes yet!)
- add requirements for fuel-devops-driver-ironic

Change-Id: I736f7f6328bd38ab48f2fbfcf0df7ae407c9c6a5
8 files changed