[ISSUE #953] fix limiter with goroutine cover#952

ShannonDing merged 2 commits intoapache:masterapache/rocketmq-client-go:masterfrom

maqingxiang:feature-limiter-with-goroutine-covermaqingxiang/rocketmq-client-go:feature-limiter-with-goroutine-coverCopy head branch name to clipboard