python test driver: file results in test.result.log

... rather than test.result.out.

Author: setton

testsuite/drivers/basic.py

@@ -51,7 +51,7 @@ def run(self, previous_values, slot):
                     errors = obj(wd)
 
             if len(errors) > 0:
-                self.result.out = "\n".join(errors)
+                self.result.log = "\n".join(errors)
                 status = TestStatus.FAIL
 
             self.result.set_status(status)