[CXF-4988] Making sure MultipartProvider does not interfere when the multipart payload is expected to be read directly, updating the way the providers are sorted - trunk only

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1475978 13f79535-47bb-0310-9956-ffa450edef68
[CXF-4988] System test updates

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1475979 13f79535-47bb-0310-9956-ffa450edef68