test-driver: respect timeout in wait_until_fails

- `wait_until_fails` was not passing through its `timeout` argument to
  the internal `retry` function, hence was always using 900 seconds (the
  default timeout for `retry`) rather than the user-specified value.

nixos/lib/test-driver/test_driver/machine.py

@@ -641,7 +641,7 @@ class Machine:
             return status != 0
 
         with self.nested(f"waiting for failure: {command}"):
-            retry(check_failure)
+            retry(check_failure, timeout)
             return output
 
     def wait_for_shutdown(self) -> None: