BSC: log BTS number on failure

It's useful to see which BTS exactly has failed the test in
configuration with multiple BTS on single BSC.

Change-Id: Ib813635862c04d51a30e7bbcca4ec05ce664f7e9
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 13535ce..29961e5 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -243,7 +243,7 @@
 		}
 		f_sleep(0.1);
 		if (not T.running) {
-			setverdict(fail, "Timeout waiting for oml-connection-state ", status);
+			setverdict(fail, "Timeout waiting for BTS" & int2str(bts_nr) & " oml-connection-state ", status);
 			mtc.stop;
 		}
 	}