FTP parser has been moved away from the archaic AppLayeParseElement.

https://buildbot.suricata-ids.org/builders/poona/builds/25

Performance Report:
With 0003 commit, i.e. the disabling SSH parser commit, I have noticed a minor drop in performance, around 5-7%.

CHANGES:
Remains the same as its parent PR, except that it introduces a new commit that disables the SSH parser.

Parent PRs -
#601 - https://github.com/inliniac/suricata/pull/601