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

*** 211,221 ****
  
          /* kcred is never freed, so we don't need zone_cred_hold here */
          kcred->cr_zone = &zone0;
  
          priv_fillset(&CR_LPRIV(kcred));
!         CR_IPRIV(kcred) = *priv_basic;
  
          /* Not a basic privilege, if chown is not restricted add it to I0 */
          if (!rstchown)
                  priv_addset(&CR_IPRIV(kcred), PRIV_FILE_CHOWN_SELF);
  
--- 211,221 ----
  
          /* kcred is never freed, so we don't need zone_cred_hold here */
          kcred->cr_zone = &zone0;
  
          priv_fillset(&CR_LPRIV(kcred));
!         CR_IPRIV(kcred) = *priv_default; /* XXX: Really needed here? */
  
          /* Not a basic privilege, if chown is not restricted add it to I0 */
          if (!rstchown)
                  priv_addset(&CR_IPRIV(kcred), PRIV_FILE_CHOWN_SELF);