Exit with failure if not enough resources are found

Change-Id: I9e38435ff71416585a259c823053bd07c670d495
diff --git a/src/osmo-gsm-tester.py b/src/osmo-gsm-tester.py
index 766f356..9b7ae25 100755
--- a/src/osmo-gsm-tester.py
+++ b/src/osmo-gsm-tester.py
@@ -198,6 +198,7 @@
                 trials_run.append(current_trial)
         except Exception:
             # Do not catch here subclasses of BaseException such as SystemExit, let them finish the program
+            any_failed = True
             current_trial.log_exn()
 
     sys.stderr.flush()