library: Ensure setverdict(fail) is followed by mtc.stop

This will prevent subsequent failures from overwriting the verdict so we
can easily see the root cause of the test failure.

Using testcase.stop instead for errors internal to our test
infrastructure to mark them as test errors instead of failed.

Change-Id: Idc6819aaf0b01e70c38fad828dd44dcec6bdd778
diff --git a/library/LAPDm_RAW_PT.ttcn b/library/LAPDm_RAW_PT.ttcn
index bdfc50b..6b8f9fb 100644
--- a/library/LAPDm_RAW_PT.ttcn
+++ b/library/LAPDm_RAW_PT.ttcn
@@ -320,7 +320,7 @@
 			var TBF_UL_establish_res res;
 			if (isvalue(g_tbf_ul[tbf_nr].arfcn)) {
 				setverdict(fail, "Cannot establish UL TBF ID ", tbf_nr, ": BUSY");
-				self.stop;
+				mtc.stop;
 			}
 			f_establish_tbf(tbf_ul_req.ra);
 			if (ph_state == PH_STATE_TBF) {
@@ -340,7 +340,7 @@
 			var TbfNr tbf_nr := tbf_dl_req.tbf_nr;
 			if (isvalue(g_tbf_dl[tbf_nr].arfcn)) {
 				setverdict(fail, "Cannot establish DL TBF ID ", tbf_nr, ": BUSY");
-				self.stop;
+				mtc.stop;
 			}
 			g_tbf_dl[tbf_nr] := tbf_dl_req.pars;
 			f_L1CTL_TBF_CFG(L1CTL, false, tbf_dl_req.pars.tfi);