BSC_ConnectionHandler: make VTY interface available

The BSC_ConnectionHandler currently has no access to the VTY interface.
Lets make it available so that upcoming tests can use the VTY interface
to trigger actions (e.g. Paging, see also Change Id:
6a1a6bd6da1bf46d6d703be495795d3610ca431)

Change-Id: I684f0a3a435924d81bc5a793cb7b43a3ab9ef842
Related: OS#3615
diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index e97b97d..1b31f75 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -36,10 +36,14 @@
 import from Osmocom_CTRL_Types all;
 import from Osmocom_CTRL_Adapter all;
 
+import from TELNETasp_PortType all;
+import from Osmocom_VTY_Functions all;
+
 /* this component represents a single subscriber connection */
 type component BSC_ConnHdlr extends BSSAP_ConnHdlr, MNCC_ConnHdlr, GSUP_ConnHdlr, MGCP_ConnHdlr, SMPP_ConnHdlr, CTRL_Adapter_CT {
 	var BSC_ConnHdlrPars g_pars;
 	timer g_Tguard := 60.0;
+	port TELNETasp_PT MSCVTY;
 }
 
 type record BSC_ConnHdlrNetworkPars {
@@ -134,6 +138,10 @@
 	if (g_pars.ipa_ctrl_enable == true) {
 		f_ipa_ctrl_start(g_pars.ipa_ctrl_ip, g_pars.ipa_ctrl_port);
 	}
+
+	map(self:MSCVTY, system:MSCVTY);
+	f_vty_set_prompts(MSCVTY);
+	f_vty_transceive(MSCVTY, "enable");
 }