*_Emulation.ttcn: Specify destination when replying on procedure ports

procedure ports (like message ports) require us to specify the
destination of a message ("reply") in case it is connected 1:N and not
just 1:1.  This didn't show up as a problem so far, as we typically only
had one component talking to those procedure ports at any given point
in time.

Change-Id: I696ec67080815348bb95e43ecbbf262e533e39a3
diff --git a/library/GTP_Emulation.ttcn b/library/GTP_Emulation.ttcn
index e5e5e36..534fdef 100644
--- a/library/GTP_Emulation.ttcn
+++ b/library/GTP_Emulation.ttcn
@@ -206,12 +206,12 @@
 
 	[] CLIENT_PROC.getcall(GTPEM_register_imsi:{?}) -> param(imsi) sender vc_conn {
 		f_imsi_tbl_add(imsi, vc_conn);
-		CLIENT_PROC.reply(GTPEM_register_imsi:{imsi});
+		CLIENT_PROC.reply(GTPEM_register_imsi:{imsi}) to vc_conn;
 		}
 
 	[] CLIENT_PROC.getcall(GTPEM_register_teid:{?}) -> param(teid) sender vc_conn {
 		f_tid_tbl_add(teid, vc_conn);
-		CLIENT_PROC.reply(GTPEM_register_teid:{teid});
+		CLIENT_PROC.reply(GTPEM_register_teid:{teid}) to vc_conn;
 		}
 
 	}