BSC_Tests_ASCI: Add test to seize or release uplink by MSC

The MSC will block (seize) or unblock (release) the uplink on one BSC,
if a talker requests or releases uplink on a different BSC. An UPLINK
BUSY or UPLINK FREE message es expected to be sent to the BTS.

Change-Id: I7ebf03662e81f59d76ca8d8fa29f581043053564
diff --git a/bsc/MSC_ConnectionHandler.ttcn b/bsc/MSC_ConnectionHandler.ttcn
index 433dab5..f919fa6 100644
--- a/bsc/MSC_ConnectionHandler.ttcn
+++ b/bsc/MSC_ConnectionHandler.ttcn
@@ -758,7 +758,9 @@
 	boolean vgcs_assign_fail,
 	boolean vgcs_talker_req,
 	boolean vgcs_talker_est,
-	boolean vgcs_talker_rel
+	boolean vgcs_talker_rel,
+	boolean vgcs_uplink_seized,
+	boolean vgcs_uplink_release
 };
 
 type record TestHdlrParams {
@@ -851,7 +853,9 @@
 		vgcs_assign_fail := false,
 		vgcs_talker_req := false,
 		vgcs_talker_est := false,
-		vgcs_talker_rel := false
+		vgcs_talker_rel := false,
+		vgcs_uplink_seized := false,
+		vgcs_uplink_release := false
 	}
 }