SOLR-1943: Disable clustering contrib, part #2 (until build system fixed to do contrib-crawl)
SOLR-1943: Disable clustering contrib, part #2 (until build system fixed to do contrib-crawl)

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@953691 13f79535-47bb-0310-9956-ffa450edef68

cscorley/solr-only-mirror,cscorley/solr-only-mirror,cscorley/solr-only-mirror