Add and set transport field for RanOps structure

This will allow RAN_Emulation to have better knowledge on the protocol
stack in use, and behave differently based on that information.
For intance, forthcoming commit will append OsmuxSupport IE only if
transport is BSSAP AoIP.

Change-Id: Ife62e328af2d3f2475ff93249f2138820c7ddabb
diff --git a/bsc-nat/MSC_ConnectionHandler.ttcn b/bsc-nat/MSC_ConnectionHandler.ttcn
index 89728b4..c8cb005 100644
--- a/bsc-nat/MSC_ConnectionHandler.ttcn
+++ b/bsc-nat/MSC_ConnectionHandler.ttcn
@@ -69,6 +69,7 @@
 	decode_dtap := false,
 	role_ms := false,
 	protocol := RAN_PROTOCOL_BSSAP,
+	transport := BSSAP_TRANSPORT_AoIP,
 	use_osmux := false,
 	sccp_addr_local := omit,
 	sccp_addr_peer := omit