Check whether registry contains some addresses
        that were never connected to
        :return:

def reconcileNodeReg(self) -> set:
        """
        Check whether registry contains some addresses
        that were never connected to
        :return:
        """

        matches = set()
        for name, remote in self.remotes.items():
            if name not in self.registry:
                continue
            if self.sameAddr(remote.ha, self.registry[name]):
                matches.add(name)
                logger.debug("{} matched remote {} {}".
                             format(self, remote.uid, remote.ha))
        return self.registry.keys() - matches - {self.name}