lib: Cancel all outstanding requests at the end of a test

Quite often on catastrophic failure the test leaves a long queue of
unterminated batches pending execution. Each runs until hangcheck fires
and skips onto the next, leaving us waiting for a very long time at test
exit.

On older kernels, this gracefully degrades into the existing mechanism.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Antonio Argenziano <antonio.argenziano@intel.com>

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