Fix traceroute_test on some more Linux systems.
Fix traceroute_test on some more Linux systems.

* My Ubuntu Lucid Lynx system uses ip6-localhost instead of localhost

shineyear/catawampus,pombredanne/catawampus,ultilix/catawampus,ankurjimmy/catawampus,pombredanne/catawampus,shineyear/catawampus,ankurjimmy/catawampus,ultilix/catawampus