Experimenting with event handlers in celerybeat.
Merge branch 'bmbouter_remove_babysit' into bmbouter-1096311
Code is done, but tests are not.
Removing a few lingering copyrights from files I edited.
1042932- Move common publish steps to the platform and update publish steps to support nesting steps
Adjusting AvailableQueue lookup in tasks.py and test changes.
Loggers aren't constants.
Fix utc time issue, and some tests
Rewriting WorkerWatcher methods to use @staticmethod
Lots of docs to scheduler objects, and try/except guarding on threads.
Reordering imports and a flake8 thing
Merge branch 'bmbouter-1096289' into bmbouter-1096311

Conflicts:
	server/pulp/server/async/scheduler.py
	server/test/unit/server/async/test_scheduler.py
Build for EL 7.
Grammatical correction.
Fixing use of _()
Removing race condition, by having update set only last_heartbeat.
Reworking threads to be more explicit.
Adds whitespace to celery_instance module
Removes RESOURCE_MANAGER_PREFIX
Adds a sleep(10) to thread loop to avoid quick thrashing.