msc: Fix TC_cl3_{no,rnd}_payload

It may very well be that the MSC is first accepting the SCCP connection
and possibly sending a L3 (error) message before clearing/closing
the SCCP connection in case of errors in the COMPL L3 info.

Change-Id: I4cf08608413e9e1fb54848849baed79204f5dcd1
diff --git a/msc/MSC_Tests.ttcn b/msc/MSC_Tests.ttcn
index 10f772e..156bdd9 100644
--- a/msc/MSC_Tests.ttcn
+++ b/msc/MSC_Tests.ttcn
@@ -1046,6 +1046,8 @@
 		BSSAP.send(ts_BSSMAP_ClearComplete);
 		BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND);
 		}
+	[] BSSAP.receive(tr_PDU_DTAP_MT(?)) { repeat; }
+	[] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_CONF_IND) { repeat; }
 	[] T.timeout {
 		setverdict(fail, "Timeout waiting for ClearCommand or SCCP Release");
 		self.stop;
@@ -1083,6 +1085,7 @@
 		BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND);
 		}
 	[] BSSAP.receive(tr_PDU_DTAP_MT(?)) { repeat; }
+	[] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_CONF_IND) { repeat; }
 	[] T.timeout {
 		setverdict(fail, "Timeout waiting for ClearCommand or SCCP Release");
 		self.stop;