message: add annotation for env_check run.py
diff: import pytest
  +# coding:utf-8
  +# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
  +#
  +# Licensed under the Apache License, Version 2.0 (the "License"
  +# you may not use this file except in compliance with the License.
  +# You may obtain a copy of the License at
  +#
  +# http://www.apache.org/licenses/LICENSE-2.0
  +#
  +# Unless required by applicable law or agreed to in writing, software
  +# distributed under the License is distributed on an "AS IS" BASIS,
  +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  +# See the License for the specific language governing permissions and
  +# limitations under the License.
  +'''
  +This module is used to check whether the running environment for PaddleServing is configured correctly.
  +
  +Two test cases are set for verifying the smooth of environment, fit a line test case for C++ Serving environment and uci for Pipeline Serving enviroment
  +
  +Usage: export PYTHON_EXECUTABLE=/usr/local/bin/python3.6
  + python3.6 -m paddle_serving_server.serve check
  +'''
  +
  +
  import sys
  import os
  