Eliminate proto_tree_add_text from some dissectors.

Change-Id: I44cc6b70ec4dfc565934da499f46fca60a4ded93
Reviewed-on: https://code.wireshark.org/review/5524
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>