7388 Support DHCP Client FQDN. Allow IAID/DUID for all v4.

*** 19,28 ****
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
+  * Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
   */
  
  #ifndef _PACKET_H
  #define _PACKET_H
  
*** 120,129 ****
--- 121,132 ----
  uint_t          pkt_get_xid(const PKT *, boolean_t);
  dhcp_pkt_t      *init_pkt(dhcp_smach_t *, uchar_t);
  boolean_t       remove_pkt_opt(dhcp_pkt_t *, uint_t);
  boolean_t       update_v6opt_len(dhcpv6_option_t *, int);
  void            *add_pkt_opt(dhcp_pkt_t *, uint_t, const void *, uint_t);
+ size_t          encode_dhcp_opt(void *, boolean_t, uint_t, const void *,
+                         uint_t);
  void            *add_pkt_subopt(dhcp_pkt_t *, dhcpv6_option_t *, uint_t,
                      const void *, uint_t);
  void            *add_pkt_opt16(dhcp_pkt_t *, uint_t, uint16_t);
  void            *add_pkt_opt32(dhcp_pkt_t *, uint_t, uint32_t);
  void            *add_pkt_prl(dhcp_pkt_t *, dhcp_smach_t *);