Fix stress-tox-job.json action file.

Change I39b8a1d38f70ddda4867126b58bb7053b45654d6 changed how the
actions are called, but stress-tox-job.json was merged at the same
time. This commit updates the json definition to use the new paths
so that the tox job will work again.

Part of: blueprint stress-tests

Change-Id: Idadf08e0cc3f01650e72ca078a223781a0f1669a
1 file changed