Change the whole vty configuration for NS to be more flexible
and support more setups. Old configurations are invalid.
For further information see:
https://osmocom.org/projects/libosmocore/wiki/Network_service_(NS)
Depends-on: Ie9306ab4d4738c2c57a69987086e22771b30657e (osmo-sgsn)
Change-Id: I65fb4e52d22617cf8488d8ab77c970f84995560d
This does not break ttcn3-sgsn-test since it uses a custom config file
with the correct IPs.
Change-Id: I2a922139c50d06217e5e6105ea65bf673daa10a8
Related: OS#1700
Since October 2017 the default config name no longer has an underscore
but a dash in the filename. See osmo-sgsn.git Change-Id
If804da17a7481e79e000fe40ae0d9c4be9722e61