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Create AbusiveUserMapper to replicate an abusive user's workload #94

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Added a new WorkloadMapper, AbusiveUserMapper, that creates two types of tasks: small operations (single file listing or single folder creation) and large listing operations (configurable # of files). This is useful to see the interaction of users that have dramatically different performance impacts and resource usage. The proportion of small to large/abusive users and the number of mappers for each is configurable.

* creation). This uses {@link TimedInputFormat}; see its Javadoc for configuration information. Only requires the
* NameNode, does not make file data changes.
*
* <p>Configuration options available:
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I feel like the wording is a bit weird on some of these descriptions, suggestions welcome!

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