* Bug 1574651 - remove unused JobConsumer and related code
The `update_pulse_test_fixtures` management command listens for job
messages, so is of no use anymore.
* Bug 1574651 - refactor pulse listening to support multiple AMQP servers
This looks forward to supporting ingesting jobs and tasks from multiple
Taskcluster depoyments, each of which is on its own AMQP server (or, at
least, a vhost).
* Bug 1574651 - pass rootUrl from pulse to celery, verify against repository
When jobs and pushes are loaded, the repo's root URL is known. This
just serves to ensure that the rootUrl for the repo and the rootUrl for
the event match up.
* Bug 1574651 - use root_url from message to make in-job URLs
* Bug 1574651 - update ingest-and-push-tasks to take --root-url
Dustin J. Mitchell