If we can't connect, the leader is not available
If we can't connect, the leader is not available

If kafka gave us a broker we can't talk to (which we suspected because it was
already dead), then mark the partition as LeaderNotAvailable so that subsequent
calls to Leader don't return it unnecessarily

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