'Add an IdP-Protocol configuration.
:param idp_id: ID of IdP object
:type idp_id: string
:param protocol_id: ID of protocol object
:type protocol_id: string
:param protocol: protocol object
:type protocol: dict
:raises keystone.exception.IdentityProviderNotFound: If the IdP
doesn\'t exist.
:returns: protocol ref
:rtype: dict'

@abc.abstractmethod
def create_protocol(self, idp_id, protocol_id, protocol):

    raise exception.NotImplemented()
