give the devhub its own queue (bug 610055)

settings.py

@@ -541,6 +541,10 @@ BROKER_VHOST = 'zamboni'
 BROKER_CONNECTION_TIMEOUT = 0.1
 CELERY_RESULT_BACKEND = 'amqp'
 CELERY_IGNORE_RESULT = True
+# We have separate celeryds for processing the devhub as fast as possible.
+CELERY_ROUTES = {
+    'devhub.tasks.validator': {'queue': 'devhub'},
+}
 
 
 ## Fixture Magic