ZTS: Fix checkpoint_ro_rewind.ksh
Brian Behlendorf authored
Related to commit 90b77a03

.  Retry the `zpool export` if the pool is
"busy" indicating there is a process accessing the mount point.  This
can happen after an import and allowing it to be retried will avoid
spurious test failures.

Reviewed by: George Melikov <mail@gmelikov.ru>
Signed-off-by: default avatarBrian Behlendorf <behlendorf1@llnl.gov>
Closes #13092 
ccbe9efd
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