* [JAXRS-CXF] [issue #4386] add builder-style methods to model classes
before this change, model classes had only a default constructor and
setter methods, resulting in code like this:
myModel = MyModel();
myModel.setFirstField(firstField);
myModel.setSecondField(secondField);
return myModel;
this change adds builder style methods, such that the above code can be
written more compactly:
return MyModel().firstField(firstField).secondField(secondField);
this is consistent with other JAVA generators in swagger-codegen.
* update jaxrs-cxf sample code