Description of problem:
Add general support for host provider, specifically using Foreman, to the engine.
In first phase it would allow adding new host provider, and, when adding new hosts to the engine, it will allow selecting a provider, and choosing a host from a list of available hosts. Also, filtered search (using the provider specific search) should supported.

TBD - We might also want to add bare metal support, to allow installing hosts from scratch in the host provider, followed by adding those hosts to the engine.

Version-Release number of selected component (if applicable):
N/A

How reproducible:
N/A

Steps to Reproduce:
N/A

Actual results:
N/A

Expected results:
N/A

Additional info:
See http://www.ovirt.org/Features/ForemanIntegration (still to be updated, but can give further information on the feature).