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 vpnaas and debug filters to setup.cfg

Change-Id: I44f7e4a44276a386b6e4d8bfb8370eb103787a21
Closes-Bug: 1257523