WebUI Tests: fixing test_range test case
As described in the commit [1] and ticket [2], it should not be possible to
change the range of a local IPA domain.
The basic_crud was changed to make it flexible to do not run the mod operation
if needed.
[1] 55feea500be1f4ae7bf02ef3c48377a6751ca71d
[2] https://pagure.io/freeipa/issue/4826
Reviewed-By: Petr Vobornik <pvoborni@redhat.com>