More streaming WS-Security work

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1532401 13f79535-47bb-0310-9956-ffa450edef68
Some STS tests

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1532402 13f79535-47bb-0310-9956-ffa450edef68