Add retry jitter #86
Description
Add jitter (small random delay) to each retry strategy. If a large number of clients all start retrying a failed service at the same time, this predictable sequence can lead to a problem, where all clients hit the service simultaneously after the same delay, causing it to fail again, since the pattern is "predictable". To fix this, we should add a bit of randomness to this so to "spread" when the clients will re-hit the server.