redirect test to live server (#859)

Author: mfeurer

tests/test_datasets/test_dataset_functions.py

@@ -265,6 +265,7 @@ def test__name_to_id_with_version(self):
 
     def test__name_to_id_with_multiple_active_error(self):
         """ With multiple active datasets, retrieve the least recent active. """
+        openml.config.server = self.production_server
         self.assertRaisesRegex(
             ValueError,
             "Multiple active datasets exist with name iris",