[Piglit] Replace dmesg functions in exectest with dmesg class

[Dylan Baker]

On Friday, January 31, 2014 05:02:06 PM Dylan Baker wrote:
> This series introduces a new module with a different approach for
> working with dmesg, and 21 tests for that class.
> 
> There are several advantages to this approach as a whole:
> 1) It isolates the dmesg code better. A single module containing all of
>    the dmesg logic, and only two calls needed outside of the module make
>    it easy to use, and far less invasive
> 2) It eliminates the need for lots of if checks. By providing a dummy
>    version of the same class when checking dmesg isn't requested or
>    appropriate there is no need to constantly check if the run is
>    checking dmesg.

I forgot to mention this is available for git pull:
https://github.com/dcbaker/piglit.git dmesg-v2
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