LUCENE-5898: Remove remaining hardcoded versions from build files; add a new version.properties file

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1619906 13f79535-47bb-0310-9956-ffa450edef68
Remove keywords property. Sorry!

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1619914 13f79535-47bb-0310-9956-ffa450edef68