Fetches a list of Dynamic Routing agents hosting a BGP speaker.

def list_dragents_hosting_bgp_speaker(self, bgp_speaker, **_params):
        """Fetches a list of Dynamic Routing agents hosting a BGP speaker."""
        return self.get((self.bgp_speaker_path + self.BGP_DRAGENTS)
                        % bgp_speaker, params=_params)