release-2.2.1-RC0
Tag solr-7.x release 2.2.1 RC0

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/integration/solr-7.x/tags/release-2.2.1-RC0@1825332 13f79535-47bb-0310-9956-ffa450edef68