DHCPv6 improvements for readability

[sthaug () nethelp no]

Having started to play with DHCPv6, I found the tcpdump printout of
DHCPv6 options,

http://www.iana.org/assignments/dhcpv6-parameters/dhcpv6-parameters.xhtml#dhcpv6-parameters-2

could be improved. Below are my suggested improvements, relative to
tcpdump-4.1.1.

The change to the "NTP-server" option is just for constistency with the
rest. The "DNS-search-list" could also be called "Domain search list"
as it is in the IANA documentation.

Steinar Haug, Nethelp consulting, sthaug () nethelp no
----------------------------------------------------------------------
--- print-dhcp6.c.orig  2010-03-12 02:56:44.000000000 +0100
+++ print-dhcp6.c       2010-11-10 18:38:09.000000000 +0100
@@ -229,15 +229,15 @@
        case DH6OPT_SIP_SERVER_A:
                return "SIP-servers-address";
        case DH6OPT_DNS:
-               return "DNS";
+               return "DNS-server";
        case DH6OPT_DNSNAME:
-               return "DNS-name";
+               return "DNS-search-list";
        case DH6OPT_IA_PD:
                return "IA_PD";
        case DH6OPT_IA_PD_PREFIX:
                return "IA_PD-prefix";
        case DH6OPT_NTP_SERVERS:
-               return "NTP-Server";
+               return "NTP-server";
        case DH6OPT_LIFETIME:
                return "lifetime";
        case DH6OPT_NIS_SERVERS:
-
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