Stop installing config files

If stackalytics is being installed by config management, such as
puppet, having pip install install the config files into /etc is
challenging. Since all of the options in stackalytics.conf are
commented out, it's also not needed to run.

Change-Id: Ibab3b4389ed64fcc897c833169f69bc0bcd9ae88
Merge "Stop installing config files"