Eliminate proto_tree_add_text from some dissectors.

Change-Id: Iadd80aab291e5de714891a9f3c79edeca19e9b93
Reviewed-on: https://code.wireshark.org/review/5458
Reviewed-by: Michael Mann <mmann78@netscape.net>
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Evan Huus <eapache@gmail.com>