[Bug 1059453] [NEW] The celery cluster worker is not properly stopped

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The celery cluster is started in
upstream:src/provisioningserver/start_cluster_controller.py, called from
the upstart script packaging:debian/maas-cluster-controller.maas-
cluster-celery.upstart.  When all the MAAS' services are stopped (for
instance when all the MAAS packages are purged), the celery workers are
not properly stopped.

How to recreate:
- install the MAAS package
- run `ps aux | grep celeryd` to get the list of all the celeryd services. After the synchronization phase, you should see the region workers and the cluster workers (http://paste.ubuntu.com/1253472/ the region workers listen to 'celery' and 'master' while the cluster workers listen to a queue named after a UUID)
- remove all the packages with 'sudo apt-get purge maas*'
- run `ps aux | grep celeryd`:  the cluster workers are still running.

** Affects: maas (Ubuntu)
     Importance: Critical
         Status: Triaged

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The celery cluster worker is not properly stopped
https://bugs.launchpad.net/bugs/1059453
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