Couple more fixes for Linux raid metadata 1.x support

[Doug Nazar]

 While doing some in-depth testing came across a few more issues. The 
second one really threw me for a loop. The LVM wouldn't come up because 
it couldn't find some of the raid arrays but when I hexdumped the raid 
arrays it showed the correct uuid. Applies on top of previous patch.

- Ignore spare and faulty drives
- Set a dynamic array->number. It's used for the disk->id and is important
  for the cache subsystem that it be unique.

grub-update-raid-metadata-1x-support-2.diff
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