mq: enable SSL dissection

mq: enable SSL dissection

Register dissector as "mq" (for Export SSL PDU) and consolidate
different heuristics dissector functions into one (TCP vs. non-TCP).

Make it possible to select mq for SSL and add heuristics.

Bug: 4652
Change-Id: Ib0812dc75dda3fe47f46a917f14399f4a92f5b76
Reviewed-on: https://code.wireshark.org/review/13856
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>