hub serving服务部署接口输出问题

问题代码在paddlehub/serving/http_server.py文件中create_app()方法中的predict_serving_v3()方法中
package_result()方法中定义了返回格式`{"status": status, "msg": msg, "results": data}`
但是predict_serving_v3()方法调用这个方法返回结果的顺序却有问题
以下为原代码
```
 @app_instance.route("/predict/<module_name>", methods=["POST"])
    def predict_serving_v3(module_name: str):
        '''
        Http api for predicting.

Args:
            module_name(str): Module name for predicting.

Returns:
            Result of predicting after packaging.
        '''

if module_name not in modules_name:
            msg = "Module {} is not available.".format(module_name)
            return package_result("111", "", msg)
        inputs = request.json
        if inputs is None:
            results = "This usage is out of date, please use 'application/json' as content-type to post to /predict/%s. See 'https://github.com/PaddlePaddle/PaddleHub/blob/release/v1.6/docs/tutorial/serving.md' for more details." % (module_name)
            return package_result("112", results, "")
        inputs = {'module_name': module_name, 'inputs': inputs}
        port_str = 'tcp://localhost:%s' % client_port

client = InferenceClientProxy.get_client(pid, port_str)

results = client.send_req(inputs)

return package_result("000", results, "")

return app_instance
```
此处三次调用package_result()方法
正确的返回顺序应该为
`package_result("111", msg, "")`
`package_result("112", "", results)`
`package_result("000", "", results)`

PaddlePaddle/PaddleHub

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