Add option for skipping non-SOAP WSDL ports

Currently any wsdl:port ends up in the generated model, being it processed automatically by the underlying jaxws tooling. However, it should be possible to skip non-SOAP ports, which is particularly relevant for the webgui.

For example of such WSDL with non SOAP ports, see: http://www.webservicex.net/ConverPower.asmx?WSDL