docs: public Observable<List<VirtualMachineExtensionImageInner>> listVersionsAsync(String location, String publisherName, String type) {
          return listVersionsWithServiceResponseAsync(location, publisherName, type).map(new Func1<ServiceResponse<List<VirtualMachineExtensionImageInner>>, List<VirtualMachineExtensionImageInner>>() {
              @Override
              public List<VirtualMachineExtensionImageInner> call(ServiceResponse<List<VirtualMachineExtensionImageInner>> response) {
                  return response.body();
              }
          });
      }