bscnat: Introduce test TC_ctrl_location

It checks location-state TRAP is forwaded correctly in BSC-NAT from BSC
towards locally connected CTRL client, with variable names updated to
contain BSC/BTS indexes.
It also verifies commands can be applied (SET) in inverse direction.

Change-Id: If28aba011a1903788cacbc10c0b62954925d4b1f
5 files changed