Fix a problem with extensors that don't allow anyAttribute

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1516584 13f79535-47bb-0310-9956-ffa450edef68
With CXF 3.0, jaxb based wsdl extensions don't need to implement ExtensibilityElement

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1516585 13f79535-47bb-0310-9956-ffa450edef68