3529 iostat should display time used by dtrace
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Bryan Cantrill <bmc@joyent.com>
Reviewed by: Brendan Gregg <brendan.gregg@joyent.com>
Approved by: Garrett D'Amore <garrett@damore.org>