Non-enabled repository types make it into the apipie help-text
We need to remove the repository types from the apipie definition: https://github.com/Katello/katello/blob/master/app/controllers/katello/api/v2/repositories_controller.rb#L82. We cannot show only enabled types since the apipie cache is generated without a running Katello server (so no enabled types at all, only defined types).
As part of this, we should update the docs to direct users to another api to show those repo types. That endpoint should be implemented as well as a hammer command to list them.