Update in how GPU2 reports CPUs to OSstats page

We're working to change how the GPU2 servers report machines to the
OSstats ( https://stats.foldingathome.org/os)
page.  The goal is to list NVIDIA and ATI clients separately (both are
being lumped into a GPU2 category).

In the next few days, you may
see some weird numbers (too high or too low) on this stats page while
we switch servers over.  I'll post when we're done (hopefully only a
few days).