- Allow static_boost to specify no boost with '0', traditional kernel

   fixed pri boost with '1' or any priority less than the current thread's
   priority with a value greater than two.  Default the boost to
   PRI_MIN_TIMESHARE to prevent regular user-space threads from starving
   threads in the kernel.  This prevents these user-threads from also
   being scheduled as if they are high fixed-priority kernel threads.
 - Restore the setting of lowpri in tdq_choose().  It has to be either here
   or in sched_switch().  I accidentally removed it from both places.

Tested by:	kris

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