Java tests fail against 2.0

### TL;DR

`06:20:03.077 [info] Could not find the main class: org.junit.runner.JUnitCore. Program will exit.`

### Problem

The java tests used to OOM on the testers, now there seems to be a setup problem.  I know very little about java, so this might be a very easy fix for someone in the know. cc @broach @mgodave 

### Log

http://giddyup.basho.com/#/projects/riak_ee/scorecards/57/57-249-client_java_verify-centos-6-64/31084/artifacts/439456