ktr per cpu buffers

[Eirik Nygaard <eirikn@xxxxxxxxxxxx>]

I have added one buffer per cpu for ktr now. You can now see one what happened
on just one cpu at a time with show ktr /cNUM, where NUM goes from 0 and up. 0
being your first cpu and so on.

Some more testing before it hits the tree would be nice. Devon H. O'Dell has
done some testing on a SMP box for me.

I will commit this sometime in the end of this week.

http://leaf.dragonflybsd.org/~eirikn/ktr_percpu.patch

-- 
Eirik Nygaard