Reduce celery heartbeat/gossip messages

[BenMusch]

Celery sends periodic messages which lead to overall message counts that exceed the free CloudAMQP limits.

Name: MIT-Tab (from Cloudamqp)
Vhost@host: [email protected]
Message usage: 1.0M of 1M (100%)
Upgrade at: https://customer.cloudamqp.com/
Effect: If you reach 100% before the end of the month and you will be given a four (4) days grace period before you will be blocked from publishing or consuming more messages. If you use reach 200% you will be blocked right away.
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(If you're using Celery, make sure that you add --without-gossip --without-mingle --without-heartbeat to the Celery worker command line arguments. More Celery specific information can be found here: https://www.cloudamqp.com/docs/celery.html)