[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')
If you have the ae_class, can you just do `ae_class.fields = [FactoryGirl.create(:miq_ae_field)]`  If so, you may be able to leverage .build instead if .create.