ipatests: test_subids: test subid-match shows UID of the owner
    
    ipa subid-match should show UID of the owner instead of DN.
    
    Related: https://pagure.io/freeipa/issue/8977
    
    Signed-off-by: Michal Polovka <mpolovka@redhat.com>
    Reviewed-By: Anuja More <amore@redhat.com>