LUCENE-5394: Fix TokenSources.getTokenStream to return payloads if they were indexed with term vectors

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1557439 13f79535-47bb-0310-9956-ffa450edef68
remove fileModified method

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1557506 13f79535-47bb-0310-9956-ffa450edef68