Convert to Python 3: call print() properly

doc/examples/example_test.py

             (operator.eq, PyCalcDriver, CliCalcDriver),
         ]
         tracker = hoover.regression_test(argsrc, tests, self.driver_settings)
-        print hoover.jsDump(tracker.getstats())
+        stats_text = hoover.jsDump(tracker.getstats())
+        print(stats_text)
         if tracker.errors_found():
             self.fail(tracker.format_report())