optimizely / javascript-sdk / 803

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fix (datafile management): Update polling behavior (#266)

Summary:
- When autoUpdate is true, start the timer for the following request immediately, instead of waiting for the response to start the timer
- When the timeout fires before the response is received, wait for the response to complete and then start the next request immediately. This ensures there is at most 1 request in flight at any time.

Test plan:
Added new unit tests. Manually tested.

Issues:
https://optimizely.atlassian.net/browse/OASIS-4628

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