code: func (f *FakeDockerClient) normalSleep(mean, stdDev, cutOffMillis int) {
  	if !f.EnableSleep {
  		return
  	}
  	cutoff := (time.Duration)(cutOffMillis) * time.Millisecond
  	delay := (time.Duration)(rand.NormFloat64()*float64(stdDev)+float64(mean)) * time.Millisecond
  	if delay < cutoff {
  		delay = cutoff
  	}
  	time.Sleep(delay)
  }
docs: // Sleeps random amount of time with the normal distribution with given mean and stddev
  // (in milliseconds), we never sleep less than cutOffMillis