OAK-2005 - Use separate Lucene index for performing property related queries

Modifying the test logic to ensure that previous Lucene index is not lost. With this change Lucene does not modify existing files

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1634504 13f79535-47bb-0310-9956-ffa450edef68
OAK-1724 - Enable copying of Lucene index to local file system for read queries

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1634505 13f79535-47bb-0310-9956-ffa450edef68