NO-JIRA: initial sweep of removing empty directories in the java tree

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1618230 13f79535-47bb-0310-9956-ffa450edef68
NO-JIRA: remove straggling empty directories in extras and cpp tree

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1618231 13f79535-47bb-0310-9956-ffa450edef68