Use Redis instead of Memcached

Author: olljanat

src/mist/api/dramatiq_app.py

@@ -66,4 +66,5 @@ def after_worker_boot(self, broker, worker):
 broker = RabbitmqBroker(url=config.BROKER_URL + '?heartbeat=600')
 broker.add_middleware(LoggingMiddleware())
 broker.add_middleware(MongoConnectMiddleware())
+broker.add_middleware(Results(backend=Results.backend.REDIS, url='redis://redis:6379/0'))
 dramatiq.set_broker(broker)