Stop considering some sleeping threads are running.

PZERO used to be a special value in the first BSD releases but since
the introduction of tsleep(9) there's no way to tell if a thread is
going to sleep for a "short" period of time.

This remove the only (ab)use of ``p_priority'' outside the scheuler
logic, which will help moving avway from a priority-based scheduler.

ok visa@

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