This applies the lessons learned while applying this to Voxpupuli and
The Foreman orgs.

Also ensure the key is refreshed if expired.

The Kerberos url is quite strict, but accepting trailing `/` is probably not bad and can avoid a lot of confusion

Changes the default behavior to disable task backup when enabling
the task cleanup cron job. Users who still want backups kept
on disk will need to set the parameter to true.

The major version bump was due to dropping Puppet 5 support.

67f78b9 changed the API and is thus a
major version.

This removes cleanup of email.yaml introduced in
e6ead45. It also removes cleanup of
crons introduced in 14fce64. Both of
them should be deployed long enough that we can assume they're gone.

This was split off to theforeman/puppetserver_foreman and doesn't need
to live in this module anymore.

This function symbolizes keys in YAML which is typically what Foreman
config files use. This is hard to achieve with pure Puppet so a Ruby
function is used.

The previous approach worker, but it made sidekiq default worker process all
items from the default queue before moving to remote execution queue. This
change adds equal weight to the queues, making sidekiq pick jobs from both.

With Foreman 2.5, support to run with Passenger (technically
mod_passenger) is dropped in favor of using Puma with a reverse proxy.

This also moves the request headers part of settings.yaml to a concat
fragment to simplify some code.

It keeps in code to remove tfm-rubygem-passenger-native on EL7 which it
previously didn't do, but is nice to do. It doesn't remove mod_passenger
itself since that's not managed in this module.

In Foreman 2.4 FOREMAN_BIND was dropped and now Puma builds bind
statements based on inherited sockets from systemd. That means it's no
longer needed to match them. This gives a lot more freedom.

This PR chooses to remove the foreman.socket override if Apache is not
enabled. This then uses the default ListenStream from the socket, which
happens to be 0.0.0.0:3000 today but we don't really care.