devd based AUTOMOUNTER

[Ivan Klymenko]

> 
> Note also that the above entry for cd0 does NOT change after
> inserting various different data CDs, all different sizes, nor after
> mounting one, so that 534181888 entry is from some time before,
> perhaps the first CD inserted after boot, not sure?  Also the sizes
> are bytes, regardless of sector size (DVD above, while ad0s4 is a
> 32GiB slice on a 120GB disk).
> 
> Doesn't look like this one is going to fly.

I talked about this, that current version be non-working. but if you
make some changes in the cam/scsi|ata/atapi - it will work ...