[Piglit] Fix subtests

[Dylan Baker]

forgot to mention this is available from my github:
https://github.com/crymson/piglit.git simplify_subtests


On Tuesday, November 05, 2013 10:34:49 AM Dylan Baker wrote:
> This series attempts to fix the way piglit handles subtests. In
> particular there are two problems with subtests:
>  1. A subtest failure does not cause the test it is a part of to be a
>     failure
>  2. Each subtest writes an additional copy of itself in the json
> 
> Patch 1 attempts to correct point 1
> The primary problem with tests not failing when their subtests fail is
> that it is inconsistent with the rest of piglit; a group's status is
> that of it's lowest test or subgroup.
> 
> Patch 2 corrects point 2
> Since tests with subtests are now groups, there is no need to write an
> entry for each subtests. This reduces the size the json generated by
> ~80% (That's 1/5 of the original size). This is significant not just for
> the space savings, but because writing files is expensive.
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