Put `handleResponse` method on partitionConsumer
Put `handleResponse` method on partitionConsumer

It didn't actually use the brokerConsumer at all anymore, so it makes more sense
here.

DataDog/sarama,jepst/sarama,jimmykuo/sarama,winlinvip/sarama,scalingdata/sarama,jepst/sarama,remerge/sarama,crast/sarama,mailgun/sarama,pronix/sarama,kraveio/sarama,cep21/sarama,pronix/sarama,Shopify/sarama,mailgun/sarama,winlinvip/sarama,DataDog/sarama,remerge/sarama,Neuw84/sarama,HelixEducation/sarama,aybabtme/sarama,HelixEducation/sarama,uovobw/sarama,yangfan876/sarama,Neuw84/sarama,raisemarketplace/sarama,yangfan876/sarama,Shopify/sarama,VividCortex/sarama,uovobw/sarama,LastManStanding/sarama,vrischmann/sarama,VividCortex/sarama,scalingdata/sarama,kmiku7/sarama,rafrombrc/sarama,raisemarketplace/sarama,crast/sarama,LastManStanding/sarama,rafrombrc/sarama,aybabtme/sarama,vrischmann/sarama,jimmykuo/sarama,kmiku7/sarama,cep21/sarama,kraveio/sarama