Return unique error when automount is already or not configured
    
    Use identical return codes as ipa-client-install when uninstalling
    ipa-client-automount and it is not configured, or when calling
    it again to return that is ias already configured.
    
    https://pagure.io/freeipa/issue/7396
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Tibor Dudlak <tdudlak@redhat.com>