uts: add a concept of a 'default' set of privileges, separate from 'basic'

*** 306,316 ****
          be a superset of the target's limit set; if the target process
          has any uid set to 0 all privilege must be asserted unless the
          effective uid is 0.
          Allows a process to bind arbitrary processes to CPUs.
  
! privilege PRIV_PROC_PRIOUP
  
          Allows a process to elevate its priority above its current level.
  
  privilege PRIV_PROC_PRIOCNTL
  
--- 306,317 ----
          be a superset of the target's limit set; if the target process
          has any uid set to 0 all privilege must be asserted unless the
          effective uid is 0.
          Allows a process to bind arbitrary processes to CPUs.
  
! # XXX: This is made default merely for test purposes.  DO NOT LEAVE HERE
! default privilege PRIV_PROC_PRIOUP
  
          Allows a process to elevate its priority above its current level.
  
  privilege PRIV_PROC_PRIOCNTL