update server demo

python/examples/pipeline/imdb_model_ensemble/test_pipeline_server.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # pylint: disable=doc-string-missing
-import paddle_serving_server.pipeline as pipeline
 from paddle_serving_server.pipeline import Op, RequestOp, ResponseOp
 from paddle_serving_server.pipeline import PipelineServer
 from paddle_serving_server.pipeline.proto import pipeline_service_pb2
@@ -22,12 +21,12 @@ from paddle_serving_app.reader import IMDBDataset
 import logging
 
 _LOGGER = logging.getLogger()
-console_handler = pipeline.logger.StreamHandler()
-console_handler.setLevel(logging.INFO)
-console_handler.setFormatter(
+user_handler = logging.StreamHandler()
+user_handler.setLevel(logging.INFO)
+user_handler.setFormatter(
     logging.Formatter(
         "%(levelname)s %(asctime)s [%(filename)s:%(lineno)d] %(message)s"))
-_LOGGER.addHandler(console_handler)
+_LOGGER.addHandler(user_handler)
 
 
 class ImdbRequestOp(RequestOp):