smf: switch to a tri-state for process-security properties true=on,false=off,nil=default

*** 272,282 ****
          /* Stable */
          uid_t           uid, euid;
          gid_t           gid, egid;
          int             ngroups;                /* -1 means use initgroups(). */
          gid_t           groups[NGROUPS_MAX];
!         psecflags_t     def_secflags;
          secflagdelta_t  secflag_delta;
          priv_set_t      *lpriv_set, *priv_set;
          char            *corefile_pattern;      /* Optional. */
          char            *project;               /* NULL for no change */
          char            *resource_pool;         /* NULL for project default */
--- 272,282 ----
          /* Stable */
          uid_t           uid, euid;
          gid_t           gid, egid;
          int             ngroups;                /* -1 means use initgroups(). */
          gid_t           groups[NGROUPS_MAX];
!         scf_secflags_t  def_secflags;
          secflagdelta_t  secflag_delta;
          priv_set_t      *lpriv_set, *priv_set;
          char            *corefile_pattern;      /* Optional. */
          char            *project;               /* NULL for no change */
          char            *resource_pool;         /* NULL for project default */