[Piglit] Patch to prefix piglit window titles with "pigli : "

[Luca Barbieri]

IMHO some way of matching windows would be really awesome.

Right now if you run piglit with metacity on a machine you are using,
you will get an incessant stream of windows popping up preventing any
work, unless you set all other windows you use to topmost.

I suppose it would be even better to have piglit directly ask for the
windows to be created at the bottom of the Z order, so that it isn't
even necessary to do the matching.