[Piglit] add compression support for file backends

[Dylan Baker]

bump

On Wed, Jul 01, 2015 at 04:04:52PM -0700, Dylan Baker wrote:
> This adds a couple more unit tests, and a few fixes to the last version
> of this series, with the notable addition being support xz compression
> 
> Ilia: how would you feel about dropping shell support and just using
> backports.lzma or not having xz support?
> 
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