FTP parser has been moved away from the archaic AppLayeParseElement + ssh parser disabled temporarily.

https://buildbot.suricata-ids.org/builders/poona/builds/26

Performance Report:
I think disabling the ssh parser might bring down the perf slightly.  Will have it fixed once I push in my app layer changes.

CHANGES:
Remains the same as its parent PR, except that it introduces a new commit that disables the SSH parser + all the comments in PR #602 addressed.

Parent PRs - #601, #602