Changes

ttcn3-mgw: Set osmux bind-ip(-v6) VTY configs

Until now we forgot to properly configure the osmux socket local ip, but
that was fine because 0.0.0.0 was taken as a default.
With addition of IPv6, this changed, and the socket is not bound unless
an IP address is set (to allow conditional use of IPv4, IPv6 or both).

Depends: osmo-mgw.git Change-Id I446cd7da217e9f4a74995d7784ae55dcc60a29b7
Change-Id: Ib7e9428a10238fae395a1707d6034dc5c97b9024