close DV producers on exception

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1619609 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6400: SolrCloud tests are not properly testing session expiration.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1619612 13f79535-47bb-0310-9956-ffa450edef68