fix cluster mode, change single URL to array of URL - #37

issues found

ineffectual assignment to activeKVSync (ineffassign)

lostcancel: this return statement may be reached without using the cancelPhaseThreeContext var defined on line 156 (govet)

lostcancel: the cancelPhaseThreeContext function is not used on all paths (possible context leak) (govet)

func `(*Runtime).stopRequestSubscriptions` is unused (unused)

Error return value of `ft.requestSubscription.Unsubscribe` is not checked (errcheck)

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