ZTS: Fix EBUSY volume destroy failures

It's possible for an unrelated process, like blkid, to have the
volume open when 'zfs destroy' is run.  Switch the cleanup functions
to the destroy_dataset() helper which handles this case by retrying
the destroy when the dataset is busy.  This was done not only for
volumes but also for file systems for consistency.

Reviewed-by: Richard Elling <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #7854 

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