Yoshinori Matsunobu

Summary: Currently pt-query-digest does not support tcpdump in IPv6 format. This diff adds support for IPv6.

Example: ``` CREATE TABLE `t1` ( `id` bigint(20) NOT NULL, PRIMARY KEY (`id`) ); CREATE TABLE `t2` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`) ); insert into...