xmlrpc tests: add test for idrange auto-private-groups option
Scenarii:
- idrange-add prevents --auto-private-groups with a local id range
- idrange-mod prevents --auto-private-groups with a local id range
- auto-private-groups accepts only true/false/hybrid/empty values
Related: https://pagure.io/freeipa/issue/8807
Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>