QPID-5774: remove dependency stubs used for the old pom generation the Ant build did

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1596597 13f79535-47bb-0310-9956-ffa450edef68
QPID-5774: remove client plugins dir

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1596598 13f79535-47bb-0310-9956-ffa450edef68