[PATCH] Bug fix for LVM

[Bean]

Hi,

This patch fixes a few bug in lvm.

There can be multiple copies of meta data, it's not an error, ignore
the extra copy instead of quit.

In case of LVM on RAID, the raid device and first disk would have the
same lvm header ! The raid device would be found first, so we don't
replace pv->disk if it has been set.

grub-probe doesn't work in LVM on RAID, as it only assume one layer of
abstraction, the fix is not to rely on os, but uses grub to get the
correct abstraction information.

Fix grub-fstest to support lvm.

-- 
Bean

lvm.diff
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