Enabling multi-ue support in the open-source L2 proxy.
MR-2401 changed the argument to the init_nrUE_standalone_thread to be zero instead of the ue_id_g. This causes every port to be opened for multiple UEs to have the same value, therefore only allowing one UE to be connected to the proxy. If the ue_id_g global is an issue, we should open a new ticket for a proper fix.