RFT Exposing Zone Sleeps

[Sean Bruno]

So, after some modifications and guidance from rwatson, alc and others,
I've modified this patch a bit.  The end result is that a sleep on slab
alloc counter is displayed with a "vmstat -z".  This can be used for
diagnostics of low memory situations and has been VERY handy at Yahoo.

I've removed the sysctl to eliminate some heartache, moved the sleep
count into a proper place in the data structure, properly instrumented
the debugger function and returned the #ifdef.


Patch provided against -current.  Tested on amd64 and x86

Sean

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