Fixes #5429,BZ1102296 - Showing hosts and keys for views

API Changes: https://github.com/Katello/katello/pull/4480
Have you considered using `custom_field Fields::Reference`? Example usage is in https://github.com/theforeman/hammer-cli-foreman/blob/master/lib/hammer_cli_foreman/operating_system.rb#L25-L27 It produces more condensed output and reflects the parameter `--show-ids`