SOLR-5094: Fix order of setup in TestJmxIntegration so MBean server is running before Solr init.  Also fixes SOLR-4418 (merge r1508661)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1508662 13f79535-47bb-0310-9956-ffa450edef68