mgcp_protocol: add support for wildcarded DLCX

The request handler handle_delete_con currently rejects wildcarded DLCX
requests even though a wildcarded DLCX would be a valuable tool to
remove lingering connections from the trunk in case osmo-bsc has to be
restarted.

Change-Id: I5c2de6b2b61ee64ba9c0618fd20e8fc2fe6a5ed3
Related: SYS#5535
3 files changed