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

[Luca Barbieri]

> I guess you could set piglit to ask the WM not to manage the windows
> (or put them at the bottom if that is even possible) but that would
> make working with the windows problematic if you catually wanted to
> see/manipulate them.

I think it should only do so when run in automatic mode (through
piglit-run.py rather than executing a single test).
You could always minimize everything else if you really want to see
all the flashing windows in automatic mode.