S1AP_Emulation: add missing create_cb

At the moment we do not have a default implementation for the create_cb.
The create_cb is called to resolve the vc_conn to which a subscriber
communication belongs in case it is not found in the S1apAssociationTable,
then it is resolved from an S1apExpectTable instead.

The current implementation uses the IMSI as key to resolve the vc_conn
from the S1apExpectTable, this might not work since in S1AP the UE
context is identfied by an MME_UE_S1AP_ID / ENB_UE_S1AP_ID pair.

Related: OS#5760
Change-Id: I758e7c8d8cc445cf18acdd7a25dcde8846fd84e5
2 files changed