tests/sys/cddl/zfs/tests/cli_root/zpool_scrub/setup.ksh
Fix zpool_scrub_002_pos by reducing a race condition. The test
checks that you can cancel a scrub, but zfs is too fast; the scrub
completes before there is an opportunity to cancel it. I don't know
of any way to close this race completely, so instead I'll just
increase the amount of data to scrub, slowing down the scrub
operation.

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