[WIP] Build a small automate model using factory girl

This PR builds a small automate model with the hierarchy
 DOMAIN
      NAMESPACES
          CLASS
              INSTANCES
              METHODS
e.g.
FactoryGirl.create(:miq_ae_domain, :with_small_model, :name => 'FRED')
the goal here is to create a child that references this class. I always found FactoryGirl frustrating in this case.

do we just want to avoid it? `aeclass.fields.create(f)`

Not sure if aeclass is really the object yet. Or if it is still the proxy.