Reject ASSIGNMENT REQ with CIC but no AoIP transp addr in AoIP case

If we receive a BSSMAP ASSIGNMENT REQ for a speech channel
containing only a CIC but no AoIP transport layer address, then that's
illegal and must be rejected.

In Change-Id If362a0084de452727cd063063dfb645eca2f9beb we re-introduced
accepting CIC-only ASSIGNMENT REQ, but we failed to verify that this
actually only happens over a SCCPlite A interface.

This fixes the BSC_Tests.TC_assignment_cic_only testcase.

Change-Id: Ia6e3897edca48b9f838ea69939d9b8be7185abf8
1 file changed