Make trace tools handle multiple probes

[mfeit-internet2]

Current tracepath/tracerout/paris-traceroute are configured to only produce a single path. Need to make them handle multiple.

• Make number of queries per hop (-q in traceroute) a test parameter.
• Make tools provide that option
• Make tools parse output and produce multi-path result

[mfeit-internet2]

b8484aa Took care of getting the number of queries per hop into the test spec and limits.

Tools are programmed to balk at any value other than 1 until they're overhauled to produce multiple paths.