Raise error if DL is set to 0 or DL0 options are used
In the case that the domain level is set to 0 or replica_file is set (not
None) an error will be raised.
See: https://pagure.io/freeipa/issue/7669
Signed-off-by: Thomas Woerner <twoerner@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>