StreamProcessor with max retries set also won't retry on 409

[dehora]

https://github.com/dehora/nakadi-java/pull/232 changed the behaviour of StreamProcessor to not retry indefinitely. This might be surprising for users who expect 409 (no partition available) to be handled differently, ie always retried such that the consumer is waiting for a change to process a partition. It may be the documentation needs to be clearer on the behaviour.