Fixes #298 - Add tests to unattended controller

• When OS is sucsuffully installed, it tells foreman it was installed
  when having roles enabled, Foreman would not allow an anonymous user to change the settings
• text/plain was only being set for spoof operations...

• added a Partition table or disk layout validation and tests
• removed "self" from places its not required.
• added shortname method(for just hostname)
• added support for setting the default password as part of the settings.yaml file
• added fv method to return facts in a bit more DRY way.

added partition table model, this allows to have standard partition tables for new hosts, or a customized ones per host if required