'List enabled service providers for Service Catalog.
Service Provider in a catalog contains three attributes: ``id``,
``auth_url``, ``sp_url``, where:
- id is a unique, user defined identifier for service provider object
- auth_url is an authentication URL of remote Keystone
- sp_url a URL accessible at the remote service provider where SAML
assertion is transmitted.
:returns: list of dictionaries with enabled service providers
:rtype: list of dicts'

@abc.abstractmethod
def get_enabled_service_providers(self):

    raise exception.NotImplemented()
