Make sure that socket is closed

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/jcs/trunk@1533434 13f79535-47bb-0310-9956-ffa450edef68
Derive groupId from parent

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/jcs/trunk@1533435 13f79535-47bb-0310-9956-ffa450edef68