- isakmp: print CERT and SIG payload. fix IPsec-AH algorithm type.
- rt6: avoid duplicated IPv6 src/dst.
sync with tcpdump.org.
XXX we need to think about future synchronization with tcpdump.org...
Some of the stuff (e.g., rarpd, bootpd, dhcpd etc., libsa) still will
only support Ethernet. Tcpdump itself should be ok, but libpcap needs
lot of work.
For the detailed change history, look at the commit log entries for
the is-newarp branch.