JCR-3506 add ability of reverse lucene index check: whether all items in the repository that should be indexed are present in the index. because this check will take more time and resources it must be explicitly enabled using a system property.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/trunk@1440908 13f79535-47bb-0310-9956-ffa450edef68