LUCENE-5859: remove Version param from LuceneTestCase.newIndexWriterConfig, the grand sum of 2 tests making use of it can use the 3-arg version and reduce the noise everywhere else

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1614713 13f79535-47bb-0310-9956-ffa450edef68