Make a few cleanups:
- Remove python 2.7 stanza from setup.py
- Add requires on python >= 3.6 to setup.cfg so that pypi and pip
know about the requirement
- Remove obsolete sections from setup.cfg:
* Wheel is not needed for python 3 only repo
- Update classifiers
- Update requirements, no need for python_version anymore
Change-Id: Ibcee6e71253fceb4c46442646a99f3b58e9df26d