kernel hook for grubby

[Elan Ruusamäe]

http://glen.alkohol.ee/pld/kernel-grubby-hook.patch
it also includes few cosmetics and optimizations :)

$ rpm -qi grubby
[..]
Summary     : Command line tool for configuring grub, lilo, and elilo
Description :
grubby is a command line tool for updating and displaying information
about the configuration files for the grub, lilo, elilo (ia64), and
yaboot (powerpc) boot loaders. It is primarily designed to be used
from scripts which install new kernels and need to find information
about the current boot environment.

please accept the patch as it's really convinient just install (additional)
new kernel package and have it listed in grub's menu.lst

-- 
glen