SOLR-6387: additional map-reduce test that does forking and needs 'tr' check

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1620707 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5901:Replaced all occurences of LUCENE_CURRENT with LATEST for luceneMatchVersion

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1620718 13f79535-47bb-0310-9956-ffa450edef68