Use splnet() when we need to block timeouts rather than splimp() since the former blocks software interrupts, while the latter blocks hardware interrupts.
Use splnet() when we need to block timeouts rather than splimp() since
the former blocks software interrupts, while the latter blocks
hardware interrupts.

Avoid one place where I'm at splnet across a call to copyout.  Leave
one in place to give bde something to complain about :-).  Actaully,
I'll fix it in a subsequent commit.

Reviewed by: bde
spl conical hat to: imp

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