'sysctl dev', round two

[Dag-ErlingSmørgrav]

New patch attached; it should be considerably cleaner than the
previous one.  A couple of surprises, though:

 - unattached devices still aren't picked up, which they should if
   they have a device_t.  For instance, I don't see a sysctl entry for
   the following:

none0 at pci0:31:3:        class=0x0c0500 card=0x24c21458 chip=0x24c38086 rev=0x02 hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82801DB/DBM (ICH4/M) SMBus Controller'
    class    = serial bus
    subclass = SMBus

 - USB devices don't seem to report their location or pnpinfo.

DES
-- 
Dag-Erling Smørgrav - des at des.no

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