it has been deprecated in libosmocore.git 2.5 years ago:
commit 7e0686c6b4b456ec4e6e15689694b1bcf96c301f
Author: Neels Hofmeyr <neels@hofmeyr.de>
Date: Mon Sep 10 20:58:52 2018 +0200
Change-Id: Ieb9e958278e7bb9d5e798f83b70dcb873a25d06d
Base on docker-playground.git's ttcn3-sgsn-test/*.cfg files, change IPs
to 127.0.0.* (keep last octet), log to stderr. The reasoning behind the
IP change is, that using almost the same IP as in the docker configs
makes it easier to compare the configs.
Change-Id: I15b5a943e9c665dfd4eb6b30bff84afc8adeb4a2