* Support forwarding messages with multiple BSCs
* sccp_sap_up_ran: ignore RAN until MSC is connected
* Send RESET to MSC on start up
* Store MSC
* Store BSCs
* bsc_nat: use sub-structs for cn, ran
* bsc_nat_print_addr: pass net enum, not sccp_inst
* Reply to BSC's RESET with RESET ACK directly