fix imangnet pipeline err

python/examples/pipeline/imagenet/README.md

-# Simple Pipeline WebService
+# Imagenet Pipeline WebService
 
-This document will takes UCI service as an example to introduce how to use Pipeline WebService.
+This document will takes Imagenet service as an example to introduce how to use Pipeline WebService.
 
 ## Get model
 ```
-sh get_data.sh
+sh get_model.sh
 ```
 
 ## Start server
 
 ```
-python web_service.py &>log.txt &
+python resnet50_web_service.py &>log.txt &
 ```
 
-## Http test
+## RPC test
 ```
-curl -X POST -k http://localhost:18082/uci/prediction -d '{"key": ["x"], "value": ["0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332"]}'
+python pipeline_rpc_client.py
 ```