a quick way to list the disks

In the zfs prefered /dev/disk/by-id format.
adds prefixOfChoice and commnets

you need to consitently choose a prefix for disk by id.
Adds the zpool section

Now this script can be used to tell what disks are connected to zfs pools and
what disks are avail.
Merge pull request #1 from stevenburgess/diskID

adds diskID