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

@@ -306,11 +306,12 @@
         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
+# 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