Add some plumbing in preparation for wss support on the client side

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1460928 13f79535-47bb-0310-9956-ffa450edef68
Add some comments

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1460929 13f79535-47bb-0310-9956-ffa450edef68