Add AsyncProducer option?

[dkt1412]

From what I can tell, Sangrenel uses sync producers (right?). If so, it would be nice to be able to play around with an async producer as well to observe the batch sending from the producer side and observe how well the brokers handle different incoming batch sizes.

[jamiealquiza]

It is sync, so it requires at least one ack per write. I have this open issue regarding that: https://github.com/jamiealquiza/sangrenel/issues/10 - which I'll close since the title here is more explicit. The idea is to pass in the required number of acks (0 for async).