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
* Some other sections are obsolete
- Update classifiers
- Update requirements, no need for python_version anymore
Change-Id: Ied76eaab93663d66a2d8255e7cab22ad0c46d81b
Manually updating the requirements, since this project isn't in
the list getting requirements syncs from global requirements. Updating
hacking required some format changes to docstrings, and I included those
in this patch.
Change-Id: Ib33f6308ed121fa2350eb32846e476f2a9dd28f4
zhurong