Install Ironic on the new RH OpenStack deployment

[tzumainn]

This is a followup to #655. From Surbhi's research:

2. Does it support Ironic?

Ironic is supported, the docs just need lots of work and that is underway right now.
Bare metal provisioning uses Metal3, which leverages Ironic on the backend. However, this is currently for static networking only, without any ML2 plugin integration.
ML2 plugin integration is being focused only for BMaaS workloads.

It mean bare metal provisioning through Metal3 uses static networking without ML2 plugin integration. This means that network configurations must be pre-defined and cannot be dynamically adjusted by Neutron during provisioning.
BMaaS workloads that require dynamic networking will not function without ML2 plugin support.