* Add a local node queue to execute targeted jobs
* Add a setting for active cluster node id (per-node)
* Base the heartbeat time on the `modified` time on the Instance table
* Add periodic task that calls save() on the instance to update the
heartbeat time if services are up
* Purge/update any ha/instance management commands
* Fix up CELERY_ROUTES settings data structure
* Gut the HA middleware
* Purge concept of primary and secondary.
* UUID is not the primary host identifier, now it's based mostly on the
username. Some work probably still left to do to make sure this is
legit. Also removed unique constraint from the uuid field. This
might become the cluster ident now... or it may just deprecate
* No more secondary -> primary redirection
* Initial revision of /api/v1/ping
* Revise and gut tower-manage register_instance
* Rename awx/main/socket.py to awx/main/socket_queue.py to prevent
conflict with the "socket" module from python base
* Revist/gut the Instance manager... not sure if this manager is really
needed anymore
Changes:
* split register_instance into register_instance and update_instance
* register_instance may only create an instance if an instance doesn't already exist and may not modify an existing instance. Before --hostname would modify the hostname for an already registered instance
* register_instance removed --timid parameter and always behave like timid is on
* remove_instance now accepts --hostname to match an instance to remove
* register_instance added better usage message
