Currently, to boot a machine to a given kernel, you
have to log into it, look up the title for the kernel
you want to boot to from grub.conf, and then run
boottool --title=$title --boot-once.
It'd be nice to have a function added to the sut script
that handles doing these things, with just invoking
`sut boot-once linux-2.6.17-rc1` or whatever, and have
it perform the necessary steps.