add more BTRFS support

[Gene Czarcinski]

OK, my first attempt to get this accepted as a bug report with patches 
to fix the problem seems to have been ignored.  The patches to os-prober 
needed for the btrfs support have been submitted to os-prober upstream 
and are currently being staged to Fedora 17 and Fedora 18 as os-prober-1.57.

Grub2 will work fine with these patches if os-prober has not been 
updated and os-prober will work fine if grub2 is not updated.

BUT, you need both sets of updates for the needed btrfs support.

The basic btrfs support grub2 patch is attached.
Also attached is a fix to support a btrfs volume to be on multiple devices.

Gene

0001-Add-btrfs-support-for-root-and-boot-on-a-subvolume.patch
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