Split LBMR tap into 5 separate taps. Make the associated tap data use fixed-length fields. The idea is to allow user-written tap
listeners easier access to the tap data. Also correct the conditions (in packet-lbmc.c) under which a subdissector would be
called, if present.

Change-Id: I5244cfbd17314058f7d3b9f42d647e0e6c375e14
Reviewed-on: https://code.wireshark.org/review/3007
Reviewed-by: Evan Huus <eapache@gmail.com>
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Reviewed-by: Anders Broman <a.broman58@gmail.com>