记 euler2 分布式例子run_ppi.sh 失败的原因

环境：源码编译master分支代码
问题：尝试跑分布式例子 tf_euler/scripts/run_ppi.sh 有报错No module named tf_euler.__main__;
原因： master分支代码tf_euler文件夹下缺少__main__.py 文件，并且同时tf_euler/python文件夹下缺少如run_loop.py 等诸多文件 （1.0分支下是有这些文件的）

是否run_ppi.sh 这个分布式例子已在euler2中废弃？ 希望能在euler2中补充相关分布式例子哈

Start with tf_euler/scripts/run_ppi.sh and reproduce the No module named tf_euler.__main__ error on the master branch. Compare the master tf_euler and tf_euler/python directories with the 1.0 branch, then determine whether run_ppi.sh is deprecated. Done means the distributed example is restored and runnable, or its retirement and replacement are clearly documented.

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