Eliminate proto_tree_add_text for some dissectors.

Change-Id: Ide14bcac0b1563bee4260ac9c1a280ba99e97e71
Reviewed-on: https://code.wireshark.org/review/5261
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: Anders Broman <a.broman58@gmail.com>