Update v3 identity domain negative tests to work w/ pre-prov

I don't see any limitations by using pre-provisioned
credentials for these tests:

* test_create_domain_with_empty_name
* test_create_domain_with_name_length_over_64
* test_delete_active_domain
* test_delete_non_existent_domain
* test_domain_create_duplicate

Change-Id: Id5ff861dbd723de46e61bb596b1f1f3d8d1c439b
1 file changed