[PATCH] use UUID to map system devices to grub devices

As requested by Robert on IRC, this is a split from my dmraid patch.
On dmraid devices HDIO_GETGEO returns 0 for all fields, so the current
way of grub_util_biosdisk_get_grub_dev just can't work.
So I use blkid to get the UUID of the device and then a new nested
function to find out the grub device like search does.

I think this is with intent from the kernel that it just returns 0's.
Maybe it just can't distinguish between a device mapper setup which goes
over multiple partitions or harddisks of different size not from one
which goes only over complete harddisks with same size like in dmraid
Hm but even if, I think it wouldn't help in case of RAID != 1. Sector
count could be > then last sector of one disk or not?

-- 
Felix Zielcke
Proud Debian Maintainer

find_by_uuid.patch
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