We should be warning if a controlled component becomes uncontrolled, or vice versa.

I thought this was fixed in https://github.com/facebook/react/issues/5821, but apparently it was either not fixed for checkbox components, or maybe I subsequently broke it in https://github.com/facebook/react/pull/7003 (or similar).  Regardless, we should fix it.

Demo of case that should warn: https://jsfiddle.net/s4742gkk/

ReactDOM.render(stub, container);
    ReactDOM.render(<input type="radio" defaultChecked={true} />, container);
    expect(console.error.calls.count()).toBe(1);
    expect(console.error.calls.argsFor(0)[0]).toContain(
      'A component is changing a controlled input of type radio to be uncontrolled. ' +
      'Input elements should not switch from controlled to uncontrolled (or vice versa). ' +
      'Decide between using a controlled or uncontrolled input ' +
      'element for the lifetime of the component. More info: https://fb.me/react-controlled-components'
    );
  });
  it('should warn if uncontrolled radio switches to controlled', function() {
    var stub = <input type="radio" />;
    var container = document.createElement('div');
    ReactDOM.render(stub, container);
    ReactDOM.render(<input type="radio" checked={true} />, container);
    expect(console.error.calls.count()).toBe(1);
    expect(console.error.calls.argsFor(0)[0]).toContain(
      'A component is changing an uncontrolled input of type radio to be controlled. ' +
      'Input elements should not switch from uncontrolled to controlled (or vice versa). ' +
      'Decide between using a controlled or uncontrolled input ' +
      'element for the lifetime of the component. More info: https://fb.me/react-controlled-components'
    );
  });
  it('should not warn if radio value changes but never becomes controlled', function() {
    var container = document.createElement('div');
    ReactDOM.render(<input type="radio" value="value" />, container);
    ReactDOM.render(<input type="radio" />, container);
    ReactDOM.render(<input type="radio" value="value" defaultChecked={true} />, container);
    ReactDOM.render(<input type="radio" value="value" onChange={() => null} />, container);
    ReactDOM.render(<input type="radio" />, container);