fixes #6652, #6578, #6738 - Enables setting auto-attach and triggers auto-attach and shows service level, BZ 1113879, BZ 1019227, BZ 999122

I think the update action should check if autoheal is true, and if so call https://github.com/cfouant/katello/blob/auto-attach/app/controllers/katello/api/v2/systems_controller.rb#L186 like so.