Run notebook/formgrader/jupyterhub on random ports during tests #508
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Sometimes the subprocesses don't exit cleanly if the test fail, which then makes subsequent tests fail (because the ports aren't available). Also, if there is something else already running on the ports that are expected to be free, the tests will fail. So, this makes the subprocesses run on random ports instead.
Ideally, the subprocesses should always exit cleanly, but that's a separate issue.