Suri fixes v1.3

Here's a rework of #816 using existing classification category for stream events. Icmpv6 fix hasbeen removed because a better version was provided by @jasonish

PR builds:
- PR build: https://buildbot.suricata-ids.org/builders/regit/builds/113
- PR pcaps: https://buildbot.suricata-ids.org/builders/regit-pcap/builds/52