Cannot make port link up using SalPortService

Use SalPortService.updatePort() with PortConfig(noRecv=false, noPacketIn=false, noFwd=false, isDown=false) in order to make the port link up.
The PortConvertor.toPortModInput() method sets the mask of the port-mod message the same as the inputted port config so the mask for the isDown bit will be false. This means that the isDown bit is not set on the switch.