Use the tarball's version of setup.cfg

setup.py sdist actually re-writes the setup.cfg using RawConfigParser
when it appends the egg-info section. This changes the whitespace
and breaks downstream patches to setup.cfg.
Add fwaas_driver.ini to setup.cfg

Change-Id: Ie8157c0df343fb1009e7bc5b3ed2f2d4b0d0afec
Closes-Bug: 1258585
(cherry picked from commit daf0d68f9fc1f878ae29061dc43c19fd3e4950ef)