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Fix #92 __heartbeat__ opens but never closes connections

This fix uses a shared Celery app instance for testing state of
dependent services. After testing the celery app's
connections are explicitly closed.

Notes on cause:
- the `redis_status()` and `celery_status()` checks create new Celery
  application instances on every test
- the Celery application instances opens up connections to redis but
  these connections are never closed.
- I'm assuming that because the connections are never closed, python
  never GC's them, so they stick around forever

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