Adds candidate endpoints to the list of endpoints to
        attempt to peer with.

        Args:
            peer_endpoints ([str]): A list of public uri's which the
                validator can attempt to peer with.

def add_candidate_peer_endpoints(self, peer_endpoints):
        """Adds candidate endpoints to the list of endpoints to
        attempt to peer with.

        Args:
            peer_endpoints ([str]): A list of public uri's which the
                validator can attempt to peer with.
        """
        if self._topology:
            self._topology.add_candidate_peer_endpoints(peer_endpoints)
        else:
            LOGGER.debug("Could not add peer endpoints to topology. "
                         "ConnectionManager does not exist.")