Remove Default user role which does not work
After permissions were migrated to filters, we do not copy filters from Default user role. See https://github.com/theforeman/foreman/blob/develop/app/controllers/roles_controller.rb#L28 and http://theforeman.org/manuals/1.7/index.html#4.1.2RolesandPermissions for more details. The fact I didn't find any bug report (it's broken since 1.5) means that either I didn't search long enough or no one is actually using it. So I'd like to know whether we should try to fix it or remove it as it seems quite confusing to me. Users can do similar tasks by using role cloning.