(fix) 修复时间轮算法多循环低效率问题 #927
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Motivation:
原方法HashedWheelTimer#normalizeTicksPerWheel循环多次，方法执行时间不稳定，效率可能会偏低。
Modification:
使用java8 HashMap的相关实现来完善该算法
Result:
Fixes #926.