SOLR-4858: svn add missing test class, and remove nocommit that was overriding randomization of updateLog in SolrTestCaseJ4 (merge r1488431)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_3@1488433 13f79535-47bb-0310-9956-ffa450edef68