Description of problem:
grub2-mkconfig fails to populate rd_MD_UUID and rd_LVM_LV resulting in an unbootable installation

Version-Release number of selected component (if applicable):
grub2-1.99-0.2.fc16.x86_64

How reproducible:
every time

Steps to Reproduce:
1. run grub2-mkconfig -o /boot/grub2/grub.cfg
2. boot system
3.
  
Actual results:
 dracut drops to shell, can't find root

Expected results:
normal boot 

Additional info:

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Generic Linux, with Linux 3.0-0.rc7.git3.1.fc16.x86_64' --class generic --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod part_msdos
	insmod ext2
	set root='(hd0,msdos8)'
	search --no-floppy --fs-uuid --set=root 8e1f3c3c-f41a-4985-8b16-b7da15a6e3cf
	echo	'Loading Linux 3.0-0.rc7.git3.1.fc16.x86_64 ...'
	linux	/vmlinuz-3.0-0.rc7.git3.1.fc16.x86_64 root=/dev/mapper/VolGroup00-fedora16 ro rd.md=0 rd.dm=0  KEYTABLE=us quiet SYSFONT=latarcyrheb-sun16 rhgb rd.luks=0 rd.lvm.lv=VolGroup00/fedora16 LANG=en_US.UTF-8 
	echo	'Loading initial ramdisk ...'
	initrd	/initramfs-3.0-0.rc7.git3.1.fc16.x86_64.img
}

should contain a kernel cmd line like:
	kernel /vmlinuz-3.0-0.rc7.git3.1.fc16.x86_64 ro root=/dev/mapper/VolGroup00-fedora16 rd_LVM_LV=VolGroup00/fedora16 rd_MD_UUID=b9438b55:1d815c8b:bfe78010:bc810f04 rd_NO_LUKS rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us