Updates to the random data generator

* Add the ability to restrict the set of words to a pre-generated list and
provide a way to share the list among the nodes in the cluster
* Use the same Random object seed on all nodes in the cluster to generate the same list of words.
Added LevelDB to pom file
Logging messages during key loading
Wrapper start/stop can be benchmarked, reports can handle missing entries for some slaves
Update XSD file
add plugin infinispan60, set version to 5.3.0.Final in infinispan53 plugin