11682 zpool iostat and status improvements
Review Request #2478 — Created Jan. 6, 2020 and submitted — Latest diff uploaded
Port from OpenZFS of a set of zpool 'iostat' and 'status' enhancements. Also added kstats in the places where the code was originally using Linux /proc to expose various state. Also updated various zfs-test cases to remove old workaround for the previously missing zpool iostat handling (this brings these test back into closer alignment with OpenZFS).