RoCE and CM dissector fixes

- fixed cm.req cm.rep bit fields
- fixed packetLength and CRC length for RoCE
- use "RoCE" or "RRoCE" instead of "InfiniBand" in COL_PROTOCOL where appropriate

Change-Id: Id491658f9368034bb2267922fa5618e1c259cd56
Reviewed-on: https://code.wireshark.org/review/4614
Petri-Dish: Bill Meier <wmeier@newsguy.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Evan Huus <eapache@gmail.com>