prepare folder for proper package

git-svn-id: https://svn.apache.org/repos/asf/james/mailbox/trunk@1539969 13f79535-47bb-0310-9956-ffa450edef68
move to proper package

git-svn-id: https://svn.apache.org/repos/asf/james/mailbox/trunk@1539970 13f79535-47bb-0310-9956-ffa450edef68