Merge changes Ia719fce3,If1a64a93,I90b025f5,I54449898,I32b7b585 into udc-dev

* changes:
  [flexiglass] Foundation for placeholder QS scene.
  [flexiglass] Foundation for placeholder shade scene.
  [flexiglass] Foundation for placeholder lock screen scene.
  [flexiglass] Foundation for placeholder bouncer scene.
  [flexiglass] Authentication logic.