updateLocalInfo(cpuUsage) {
		return cpuUsage()
			.then(res => {
				const newVal = Math.round(res.avg);
				if (this.cpu != newVal) {
					this.cpu = newVal;
					this.cpuSeq++;
				}
			})
			.catch(() => {
				/* silent */
			});
	}
Update local properties.

@memberof Node
@param {Function} cpuUsage