SOLR-2245: Reverting due to unclear license for greenmail

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1607489 13f79535-47bb-0310-9956-ffa450edef68
Reverting accidental change to change log

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1607490 13f79535-47bb-0310-9956-ffa450edef68