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: If5bd6b86e130772e6c93d640b0c637985416136d (osmo-sgsn)
Change-Id: I37d010bc4ae553c30feb2ebd2be66d23b96bf42a
Previous RAW_NS only supported NS over UDP because
it handled the UDP connection on it's own.
Because of this there was no cleanup function for the tests
because no virtual component were started.
Using the new NS_Provider allows to use the same tests over
UDP and FR with no changes.
Change-Id: I8a3b6c72798a75f434f54229fdbfc802cd13967e