OSPRay warning prints should be silent when OSPRay turned off
When the environment variables VTK_DISABLE_VISRTX and VTK_DISABLE_OSPRAY are set, OSPRay should be turned off. We should also not have a warming print that says:
vtkPVRenderView.cxx:3273 WARN| vtkPVRenderView (0x15618570): Refusing to enable OSPRay because it is not supported running in this configuration.