gbproxy: Be mover verbose about BVC-UNBLOCK failure at start-up

Change-Id: Ic849e1f932de21a443cd0274e02e0f2ccd423515
diff --git a/gbproxy/GBProxy_Tests.ttcn b/gbproxy/GBProxy_Tests.ttcn
index 2077e0f..59154e8 100644
--- a/gbproxy/GBProxy_Tests.ttcn
+++ b/gbproxy/GBProxy_Tests.ttcn
@@ -504,8 +504,9 @@
 		}
 
 	[] T.timeout {
-		setverdict(fail, "Timeout waiting for unblock of all BVCs");
-		mtc.stop;
+		setverdict(fail, "Timeout waiting for unblock of all BVCs on SGSN side; ",
+			   "unblocked so far: ", bvci_unblocked, "expected: ", g_sgsn[0].cfg.bvc);
+		/* don't stop here but print below analysis */
 		}
 	}