REST test doesn't descriminate in a_provider

[psav]

This call to setup_a_provider https://github.com/ManageIQ/integration_tests/blob/master/cfme/tests/services/test_rest_services.py#L41
Is not discriminating against providers which don't have the right fields and so it is getting a provider which doens't have the right data and then failing here https://github.com/ManageIQ/integration_tests/blob/master/cfme/rest/gen_data.py#L132 if the provider doesn't have the provisioning data for example. We need to possibly use the new_setup_a_provider which allows provider filters which I think will allow the specification of the required_fields.