Kaffe.Producer.produce_sync raises on timeout

Hey guys,

I've been facing a bug on Kaffe.Producer.produce_sync/2 when Kafka server is down and the connection times out.
I've opened an issue on https://github.com/kafka4beam/brod/issues/468 that better describes what's going on and how to reproduce.
I'd appreciate if you could jump into this issue, and I'll be glad to help in anyway I could!

Thanks!