Fix issue that could cause offline get()s to wait up to 10 seconds. #592
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OnlineStateTracker was reverting to OnlineState Unknown on every stream attempt
rather than remaining Offline once the offline heuristic had been met (i.e. 2
stream failures or 10 seconds). This means that get() requests made while
offline could be delayed up to 10 seconds each time (or until the next backoff
attempt failed).