As early as possible, create a link /bsd.booted to the /bsd kernel we

As early as possible, create a link /bsd.booted to the /bsd kernel we
presume we booted from.  If you boot from another kernel, we cannot help
you later with hibernate, sorry -- The kernel does not get a useable
filename from the bootblocks.

In the bootblocks, detect a live hibernate signature and boot from
/bsd.booted instead.

with yasuoka, lots of discussion with mlarkin, ok tom