Deal with failure to start up listeners more gracefully.
Fix a weird problem where the failure to start up the "crude" listener got reflected as a failure of the latency test. This was happening on Fedora 15 because we could not run crude at elevated priority. Part of the fix is to wait a second after starting a listener and then make sure it is running. In the case of such an early failure of "crude", we then try again without elevated priority.
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