Merge changes Id0f21876,I8e27d2d3,I6989f11d,Ie2394b9c,Iba75a955 into pi-dev

* changes:
  SF: Test coverage for resetDisplayState
  SF: Test coverage for createDisplay and destroyDisplay
  SF: Test coverage for onHotplugReceived
  SF: Test coverage for display transaction state changes
  SF: Test coverage for setupNewDisplayDeviceInternal