change(test_fail2ban): raise warning instead of error

tests/test_fail2ban.py

@@ -90,8 +90,8 @@ def main():
 
     print("Checking fail2ban state:")
     if not check_service_running("fail2ban"):
-        u.error("fail2ban is not running")
-        errors += 1
+        u.warning("fail2ban is not running")
+        warnings += 1
     else:
         u.success("fail2ban is running")