修改curator客户端，解决zookeeper宕机重启CuratorWatcherImpl中的process方法异常的问题 #215
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2.分离dubbo-tracker-zipkin到brave-dubbo中，之后会进一步修改
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使用curator做zookeeper客户端时，当zookeeper宕机重启后，curator客户端重连后会产生一个None类型的WatchEvent，调用process方法会抛异常。虽然异常会被捕捉并记录到日志中，并不会像1.x.x版本出现无法重连的问题，但是这里其实可以加上event类型限制，只对NodeChildrenChanged事件调用后面的方法。