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

*** 181,190 ****
--- 181,191 ----
   */
  #define PRIV_INFO_SETNAMES              0x0001
  #define PRIV_INFO_PRIVNAMES             0x0002
  #define PRIV_INFO_BASICPRIVS            0x0003
  #define PRIV_INFO_FLAGS                 0x0004
+ #define PRIV_INFO_DEFAULTPRIVS          0x0005
  
  /*
   * Special "privileges" used to indicate special conditions in privilege
   * debugging/tracing code.
   */