DeleteNiciraNvpDeviceCmd.java

[Soheil Eizadi]

I was reviewing the NiciraNvp code, it is a very good model of External Network 
Device in CloudStack. I noted that in DeleteNiciraNvpDeviceCmd.java, the 
function:

        @Override
        public String getEventType() {
                return EventTypes.EVENT_EXTERNAL_LB_DEVICE_DELETE;
        }

should be returning EVENT_EXTERNAL_NVP_CONTROLLER_DELETE

probably minor, but wanted to note here.
-Soheil