Turn lights out on exit (#1646)

* Add LightsDriver::reset

Function will reset all lights to off
Function needs to be called by each of the driver implementations
as needed during destruction

* Reset lights to off on exit

src/arch/Lights/LightsDriver_Linux_PIUIO.cpp

@@ -32,6 +32,7 @@ LightsDriver_Linux_PIUIO::LightsDriver_Linux_PIUIO()
 
 LightsDriver_Linux_PIUIO::~LightsDriver_Linux_PIUIO()
 {
+	LightsDriver::reset();
 	if( fd >= 0 )
 		close(fd);
 }