8.04 -> 10.04 /dev/md0 not created in intiramfs

[Christopher Chan]

> In /lib/udev/rules I found;
>
>     85_mdadm.rules
>     85_lmv2.rules
>
> If I were guessing (and I am) I would expect 85_lvm2 to be run before
> 85_mdadm, which is the wrong order. I also found 56_lvm.rules which
> doesn't seem to do anything.

mdadm should run before lvm. lvm can run on md devices and so lvm can 
have a dependency on mdadm