server: Only commit SetThreadPriority if new priority is correct (try 2)

[Matt Jones]

Could someone please review this?

Thank you,
Matt

On 7/17/07, Matt Jones <mattj at google.com> wrote:
> Fixes compliance with the test I just sent in.
>
> Try 2 adds constants for realtime min/max priorities & deletes
> todo_wine from the fixed tests
>
>