MFC rev 1.4:   Update host-mode multicast group information output.    Display IPv4 and IPv6 memberships separately.     Obey the MK_INET6_SUPPORT flag.    Display link-layer memberships.     Use addr2ascii() to correctly print non-IEEE 802 sockaddr_dl instances.    Eliminate redundant switch..case blocks.    Update copyright.    Misc style changes.
MFC rev 1.4:
  Update host-mode multicast group information output.
   Display IPv4 and IPv6 memberships separately.
    Obey the MK_INET6_SUPPORT flag.
   Display link-layer memberships.
    Use addr2ascii() to correctly print non-IEEE 802 sockaddr_dl instances.
   Eliminate redundant switch..case blocks.
   Update copyright.
   Misc style changes.

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