Improve the conf.py
Improve the conf.py

Use Upstream training version of the cleaned up conf.py.

Change-Id: Id493b417365c8a42f8e77214b7e2fdf2c1486c53

Nabs007/training-guides,harrisonfeng/training-guides,harrisonfeng/training-guides,openstack/training-guides,Nabs007/training-guides,Nabs007/training-guides,openstack/training-guides,harrisonfeng/training-guides