Merge from vendor branch TCPDUMP:

Merge from vendor branch TCPDUMP:
Import tcpdump-3.9.8:

September 10, 2007.  ken@xelerance.com.  Summary for 0.9.8 tcpdump release
Rework ARP printer
Rework OSPFv3 printer
Add support for Frame-Relay ARP
Decode DHCP Option 121 (RFC 3442 Classless Static Route)
Decode DHCP Option 249 (MS Classless Static Route) the same as Option 121
TLV: Add support for Juniper .pcap extensions
Print EGP header in new-world-order style
Converted print-isakmp.c to NETDISSECT
Moved AF specific stuff into af.h
Test subsystem now table driven, and saves outputs and diffs to one place
Require <net/pfvar.h> for pf definitions - allows reading of pflog formatted
libpcap files on an OS other than where the file was generated