ipatests: add test for sudo with runAsUser and domain resolution order.
Running commands with sudo as specific user should succeed
when sudo rule has ipasudorunas field defined with value of that user
and domain-resolution-order is defined in ipa config.
Relates to https://pagure.io/SSSD/sssd/issue/3957
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>