[Oneiric] Convert dm-raid45 to new block device plugging

[Stefan Bader]

I was discussing this with the maintainer. According to him the dm-raid45 code 
is not developed further. The goal would be to convert the dmraid user-space 
side to use dm-raid (which is a target for RAID4/5/6 that uses md).

However looking at any user-space code that was available to the public right 
now, I do not see any support for this. The table format, which is used to 
create the device-mapper targets is substantially different between the two 
modules. So user-space would have to change accordingly (and I am not sure how 
well all features would be supported at the moment).

So, at least for Oneiric, I think we need to stay with the dm-raid45. I tested 
the change below on an Intel soft-RAID5 and it survived an iozone and a bonnie++ 
run.

-Stefan
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