ref(controller): remove close_db_connection tests hack

The decorator once allowed us to work around issues with running
our test suite, but does not seem to be needed now.
Merge pull request #1830 from mboersma/remove-close-db-hack

ref(controller): remove close_db_connection tests hack
refactor(controller): the great celery purge
fix(scheduler): add gunicorn timeout for long-running methods
Merge pull request #1834 from gabrtv/purge-celery

Remove Celery from the Controller
chore(registry): bump version to v0.8.1
test(registry): remove unit tests

the unit tests are outdated, useless and consistently failing. We were
cloning and running the unit tests correctly some months ago, but now
it requires a local redis. Unit tests are covered by
docker/docker-registry, anyways.
Merge pull request #1838 from bacongobbler/bump-registry

chore(registry): bump version to v0.8.1
refactor(scheduler): switch to fleet http api
chore(*): bump CoreOS to 438.0.0; Docker to 1.2.0; fleet to 0.8.0
hack(tests): query router to remove stale nginx worker