Compatible python3 in datax/bin

[zhongjiajie]

Make datax/bin python script work in python3 environment

This patch is minimum change to make script work in python3. So don't make script code more pythonic. If this patch be merge will going to make code more pythonic.

[CLAassistant]

All committers have signed the CLA.

[zhongjiajie]

@binaryWorld PTAL, thanks. I already test in my own environment with both python2 and python3

[xrfinbupt]

为撒没有反馈呢 @zhongjiajie

[zhongjiajie]

@xrfinbupt 你可以在 https://github.com/zhongjiajie/DataX/releases 下载相关的二进制文件

[zxyle]

@zhongjiajie 需要同意CLA 参考 https://cla-assistant.io/alibaba/datax

[zhongjiajie]

All committers have signed the CLA.

@zxyle You could see that, I already signed it