Refactor offset commit request tests so they don't cause warnings
Refactor offset commit request tests so they don't cause warnings

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