Replace ether_to_str with either address_to_str or tvb_ether_to_str.

Change-Id: I8cce9fddbfe950e27e96ea8a5a6d2e0921ff4260
Reviewed-on: https://code.wireshark.org/review/5933
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Reviewed-by: Michael Mann <mmann78@netscape.net>