6494 ASSERT supported zio_types for file and disk vdevs
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Albert Lee <trisk@omniti.com>
Author: Steven Hartland <steven.hartland@multiplay.co.uk>
illumos/illumos-gate@f693d300fbefaa2bd9a229a874b5994532a30d87