diskinfo should show entries for retired disks
While debugging issues related to disk failures in the Samsung and Joyent clouds, it became clear that the lack of observability for disks that have been "retired" by FMA creates a lot of confusion for admnistrators.
The biggest problem is that a "retired" disk is completely hidden in the output of commands like format(1m) and diskinfo(1m) - effectively making it indistinguishable from a disk that has been physically removed.
This ticket to cover modifying diskinfo(1m) to parse /etc/devices/retire_store and print some sort of entry for any retired disks.
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