Refs #6126: Change RHSM API to /rhsm.
Refs #6806: Remove references to passencrypt.

Note this also removes the database configs which are now provided
by the Foreman core app.
Refs 6297 - use foreman-tasks instead of delayed jobs

We now enable the foreman::plugin::tasks to handle the async tasks
Fixes #6544 - q to receive candlepin events

This creates a queue so that katello can receive candlepin events.
It also sets up the queue's url and address in katello.yml so katello can
connect to the queue. This also adds the Katello user to the qpidd users
group.
Fixes #7882 - Added support for Oracle Linux (squashed commits)
Fixes #7882 - Added support for Oracle Linux (squashed commits)