Fix goroutines leakage when flushing hystrix configuration #64
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Bug Description:
Flushing hystrix configuration will neither close the existing metric updates channel nor reusing the existing the channel when re-creating the new metricsExchange and pool metrics.
As such, it would cause a go-routines leakage that all old metrics updates channel are waiting for non-existing new items to increase the deleted metrics.
As a result, it would be better to close the updates channel when flushing the hystrix configurations.