mgcp_client: don't configure "bts base"

There should not be any BTS base port to be configured at an MGCP client.

Possibly this is related to the legacy behavior of libosmo-legacy-mgcp, and
certainly has no place in libosmo-mgcp-client.

Further changes may be needed to follow up on removal of the BTS base port
concept, at least drop it from the VTY for now.

Change-Id: I36e46208d7b75611e5ade3c74d8e1c25870de511
3 files changed