LUCENE-5936: Add backcompat checks to verify what is tested matches known versions

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1624326 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5933: add FilterSpans

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1624327 13f79535-47bb-0310-9956-ffa450edef68