These tests verify that osmo-mgw handles requests no matter of IP
version used in the remote address.
Change-Id: Ib134dda5a8f7c8f50968b6ce330f9986ae72575d
Latest osmo-mgw release is 1.7.0, so this param is not needed at all.
Furthermore, the config can be moved to .cfg.
Change-Id: I537c0f5fd6f9e18e111c773c0e42e5f1120ce2f4