def get_last_sync_file(self):
        return os.path.abspath(self.yolk_dir + "/last_sync")
L{hosts.Resolver.lookupAddress} returns a L{Deferred} which fires with
dataset/ETHPy150Open cakebread/yolk/yolk/pypi.py/CheeseShop.get_last_sync_file--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/names/test/test_hosts.py/HostsTestCase.test_lookupAddressNotFound