* WIP First pass
* started removing feature flags and adjusting logic
* Add decorator
* moved to dispatcher decorator
* updated as many as I could find
* Keep callback receiver working
* remove any code that is not used by the call back receiver
* add back auto_max_workers
* added back get_auto_max_workers into common utils
* Remove control and hazmat (squash this not done)
* moved status out and deleted control as no longer needed
* removed unused imports
* adjusted test import to pull correct method
* fixed imports and addressed clusternode heartbeat test
* Update function comments
* Add back hazmat for config and remove baseworker
* added back hazmat per @alancoding feedback around config
* removed baseworker completely and refactored it into the callback
worker
* Fix dispatcher run call and remove dispatch setting
* remove dispatcher mock publish setting
* Adjust heartbeat arg and more formatting
* fixed the call to cluster_node_heartbeat missing binder
* Fix attribute error in server logs
this commit implements the bulk of `awx-manage run_dispatcher`, a new
command that binds to RabbitMQ via kombu and balances messages across
a pool of workers that are similar to celeryd workers in spirit.
Specifically, this includes:
- a new decorator, `awx.main.dispatch.task`, which can be used to
decorate functions or classes so that they can be designated as
"Tasks"
- support for fanout/broadcast tasks (at this point in time, only
`conf.Setting` memcached flushes use this functionality)
- support for job reaping
- support for success/failure hooks for job runs (i.e.,
`handle_work_success` and `handle_work_error`)
- support for auto scaling worker pool that scale processes up and down
on demand
- minimal support for RPC, such as status checks and pool recycle/reload
