[Piglit] [PATCH][RFC] Add dmesg option for reboot policy

[yann.argotti at linux.intel.com]

This adds a policy which advises when user should reboot system to avoid
noisy test results due to system becoming unstable, for instance, and
therefore continues testing successfully.
To do this, a new Dmesg class is proposed which is not filtering dmesg and
monitors whether or not one of the following event occurs:
- gpu reset failed (not just gpu reset happened, that happens way too
often and many tests even provoke hangs intentionally)
- gpu crash,
- Oops:
- BUG
- lockdep splat that causes the locking validator to get disabled
If one of these issues happen, piglit test execution is stopped
-terminating test thread pool- and exit with code 3 to inform that reboot
is advised.
Then test execution resume, after rebooting system or not, is done like
usually with command line parameter "resume".

To call it, use command line parameter: --dmesg monitored
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