MFC: r287473
Add the new sesutil(8) utility for managing SCSI Enclosure Services (SES) device.

MFC: r287493
Fix iteration bug

MFC: r287485, r287494, r287992
Please the angry gcc 4.2 gods

MFC: r287988
Improve and expand sesutil(8)

Return an error if no matching device is found
Locate can address a slot, in addition to a drive
Added fault, similar to locate but blinks a different LED
Added the map command, lists all devices connected to the SES controller
Added the status command, overall status of the SES controller

MFC: r292092
sesutil: fix map not printing the status of the LED device in an array

MFC: r292093
sesutil: pass the correct element type when printing the SES map

MFC: r292121
sesutil: Add extra information specific to some SES devices to sesutil map

MFC: r292122
Fix sesutil locate when a sesid is passed to locate command

MFC: r292262
Show the enclosure name and id in sesutil map

Relnotes: yes
Sponsored by: Gandi.net
Sponsored by: ScaleEngine Inc.