LUCENE-4987: Upgrade randomized testing to version 2.0.10: 
Test framework may fail internally due to overly aggresive J9 optimizations. 




git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1480459 13f79535-47bb-0310-9956-ffa450edef68