Migrate test classes for Lucene 4 API

git-svn-id: https://svn.apache.org/repos/asf/maven/indexer/branches/lucene-4.6@1575143 13f79535-47bb-0310-9956-ffa450edef68
Update lucene to 4.6 in parent pom

git-svn-id: https://svn.apache.org/repos/asf/maven/indexer/branches/lucene-4.6@1575144 13f79535-47bb-0310-9956-ffa450edef68