Select Puppet::server_implementation from installer
In some environments it might be preferred to use the JVM Puppetserver instead of the Puppet Master Passenger.
The theforeman/puppet-puppet module has this feature already included.
Therefore the katello/puppet-capsule module only needs to pass the parameter to the
(Hopefully I will submit a patch to the
katello/puppet-capsule module soon. Im currently performing some local tests.)