Fixed cherry pick from public collections branch. `ObjectPermissionMixin.__get_all_user_permissions()` still needs content type in `master` branch.
Fixed cherry pick from public collections branch. `ObjectPermissionMixin.__get_all_user_permissions()` still needs content type in `master` branch.

kobotoolbox/kpi,kobotoolbox/kpi,kobotoolbox/kpi,kobotoolbox/kpi,kobotoolbox/kpi