Using Python Official Script "2to3" to Upgreade

First of all, this first subtask is the basis of  Ambari python3 adaption.

1. Dowload Ambari source code here:

https://github.com/apache/ambari/releases/tag/release-2.7.5

2. Install 2to3 in your environment( if you had install it, skip this step):

pip install 2to3

3. Upgrade Ambari Python Files:

   cd apache-ambari-2.7.5-src

   python3 /usr/bin/2to3 -w .

Attention: this upgrade will overwrite the src code.

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