Removing StAX-specific tests

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/wss4j2.0-port@1481049 13f79535-47bb-0310-9956-ffa450edef68
Enabled policy validation via the ws-security-policy-stax layer in WSS4J

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/wss4j2.0-port@1481050 13f79535-47bb-0310-9956-ffa450edef68