Fix tck failure due to double wrapping JAXBElements

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1524087 13f79535-47bb-0310-9956-ffa450edef68
Fix TCK failure.  TCK doesn't like the HTTP method being available on the client side.

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1524088 13f79535-47bb-0310-9956-ffa450edef68