pyFlakes issues fixed. Simple refactoring

workspace_tools/host_tests/wait_us_auto.py

@@ -15,14 +15,11 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-from host_test import Test, DefaultTest
+from host_test import DefaultTest
 from time import time
 from sys import stdout
 
 class WaitusTest(DefaultTest):
-    def print_result(self, result):
-       print "\n{%s}\n{end}" % result
-
     def run(self):
         test_result = True
         # First character to start test (to know after reset when test starts)