lib: Make it possible to abort the whole execution from inside of a test

igt_abort_on_f() is introduced which does very little cleanup and causes
a hard exit() of the test binary with a unique exit code
(IGT_EXIT_ABORT).

The exit code informs the monitoring process that there is a critical
issue with the testing environment which may have an impact on the
results if testing continues.

v2: Add a meta_test

Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>

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