test(vr4): Add end time to get_training_usage

Author: ehdsouza

test/integration/test_visual_recognition_v4.py

@@ -121,7 +121,7 @@ def test_04_training(self):
         assert train_result.get('training_status') is not None
 
         # training usage
-        training_usage = self.visual_recognition.get_training_usage(start_time='2019-11-01').get_result()
+        training_usage = self.visual_recognition.get_training_usage(start_time='2019-11-01', end_time='2019-11-27').get_result()
         assert training_usage is not None
 
         # delete collection