Refactor #2154

Updated by mhrivnak over 7 years ago

Make all aspects of the task system use django models instead of mongo. For example, pulp_celerybeat and pulp_resource_manager should no longer need connections to mongodb. Any code which uses the old mongoengine objects corresponding with these tables needs to use the new one. 

 * reserved_resources 
 * task_status 
 * workers 

 Almost all of it will be contained here: 

 This does not include any REST API work. 
 This does not include the models used by the resource manager and celery beat processes to obtain a lock. 
 This does not include scheduled calls.