LUCENE-5465: Solr Contrib map-reduce breaks Manifest of all other JAR files by adding a broken Main-Class attribute (merged trunk r1570738)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_7@1570741 13f79535-47bb-0310-9956-ffa450edef68