Build the sensors list depending of the type.

        type: SENSOR_TEMP_UNIT or SENSOR_FAN_UNIT

        output: a list

def build_sensors_list(self, type):
        """Build the sensors list depending of the type.

        type: SENSOR_TEMP_UNIT or SENSOR_FAN_UNIT

        output: a list
        """
        ret = []
        if type == SENSOR_TEMP_UNIT and self.init_temp:
            input_list = self.stemps
            self.stemps = psutil.sensors_temperatures()
        elif type == SENSOR_FAN_UNIT and self.init_fan:
            input_list = self.sfans
            self.sfans = psutil.sensors_fans()
        else:
            return ret
        for chipname, chip in iteritems(input_list):
            i = 1
            for feature in chip:
                sensors_current = {}
                # Sensor name
                if feature.label == '':
                    sensors_current['label'] = chipname + ' ' + str(i)
                else:
                    sensors_current['label'] = feature.label
                # Fan speed and unit
                sensors_current['value'] = int(feature.current)
                sensors_current['unit'] = type
                # Add sensor to the list
                ret.append(sensors_current)
                i += 1
        return ret