[Piglit] Make GLSLParserTest more strict

[Dylan Baker]

On Tuesday, June 24, 2014 04:54:14 PM Dylan Baker wrote:
> This series makes the constructor for GLSLParserTest more strict, in
> what the parser accepts and rejects. The goal of this series is to
> future-proof against recent problems with glsl parser tests where some
> used commas to seperate the require_extension key, and where some tests
> had more than one key.

Oops, patches 2 and 3 aren't quite baked yet. I'll send out a v2 with the 
fixes suggested by Ilia for patch 1
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