def stop(self):
        self._running = False
        self._stopped = True
        self._waker.wake()
Overwrite L3Scheduler's method to filter by availability zone.
dataset/ETHPy150Open felipecruz/zmqpy/zmqpy/eventloop/ioloop.py/IOLoop.stop--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/scheduler/l3_agent_scheduler.py/AZLeastRoutersScheduler._get_candidates