Update cleanup_upgrade to use destroy_dataset and destroy_pool
when performing cleanup. These wrappers retry if the pool is busy
preventing occasional failures like those observed when running
tests upgrade_readonly_pool. For example:
SUCCESS: test enabled == enabled
User accounting upgrade is not executed on readonly pool
NOTE: Performing local cleanup via log_onexit (cleanup_upgrade)
cannot destroy 'testpool': pool is busy
ERROR: zpool destroy testpool exited 1
Reviewed-by: Ryan Moeller <ryan@ixsystems.com> Reviewed-by: John Kennedy <john.kennedy@delphix.com> Reviewed-by: Igor Kozhukhov <igor@dilos.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9400