Eliminate proto_tree_add_text from some dissectors.

Change-Id: Ib160211198ca02f7eacf29d04568628c11f208a5
Reviewed-on: https://code.wireshark.org/review/5407
Petri-Dish: Michael Mann <mmann78@netscape.net>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>