Make a few cleanups:
- Remove python 2.7 stanza from setup.py
- Remove obsolete sections from setup.cfg
Change-Id: I118e991fdeea144a64a3b13b6f5b5d4789240e32
openstack-dev was decomissioned this night in https://review.openstack.org/621258
Update openstack-dev to openstack-discuss
Change-Id: Ie04e7e1e04f12433b255b1728cd62e27ccd19dfe