Add backoff_factor to __retry and set some reasonable values #59
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Original __retry used backoff_factor 5 wich with high retry value
caused too big time between retries.
For 20 retries with backoff_factor 5:
[5, 15, 35, 75, 155, 315, 635, 1275, 2555, 5115, 10235, 20475, 40955,
81915, 163835, 327675, 655355, 1310715, 2621435, 5242875]
so this limit max retries to 10 with reasonable backoff_factor