Fix bug 1110 - Same PID for patterns with different CASE flags

Fixes bug 1110 https://redmine.openinfosecfoundation.org/issues/1110

Removes the need for the case_state on patterns in MPM.

- PR build: https://buildbot.suricata-ids.org/builders/ken-tilera/builds/114
- PR pcaps: https://buildbot.suricata-ids.org/builders/ken-tilera-pcap/builds/48