cenkalti / backoff / 106

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Fix data race when querying GetElapsedTime()

`ExponentialBackOff.GetElapsedTime()` reads start time which is reset
by `ExponentialBackOff.Reset()` which is called by `run()`, executed
in a goroutine. This creates a data race just by using:

```go
b := NewExponentialBackOff()
ticker := backoff.NewTicker(b)
b.GetElapsedTime()
```

This commit solves this by resetting the backoff timer outside the
goroutine. The ticker test has been updated for this particular data
race.

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