Add KError = 9
Add KError = 9

According official page, 9 is unused:
http://search.cpan.org/~sgladkov/Kafka/lib/Kafka.pm

But I met lots of "Unknown error, how did this happen? Error code = 9"
So I Found out:
http://search.cpan.org/~sgladkov/Kafka/lib/Kafka.pm

I think the official page is not up to date.
mailgun/sarama,yangfan876/sarama,HelixEducation/sarama,uovobw/sarama,gyroscope-innovations/legacy_sarama,betable/sarama,kraveio/sarama,jimmykuo/sarama,HelixEducation/sarama,jepst/sarama,kmiku7/sarama,mailgun/sarama,uovobw/sarama,remerge/sarama,cep21/sarama,crast/sarama,cep21/sarama,Neuw84/sarama,Shopify/sarama,raisemarketplace/sarama,Shopify/sarama,crast/sarama,yangfan876/sarama,VividCortex/sarama,VividCortex/sarama,DataDog/sarama,winlinvip/sarama,gyroscope-innovations/legacy_sarama,rafrombrc/sarama,scalingdata/sarama,vrischmann/sarama,Neuw84/sarama,kraveio/sarama,scalingdata/sarama,rafrombrc/sarama,remerge/sarama,LastManStanding/sarama,raisemarketplace/sarama,DataDog/sarama,aybabtme/sarama,kmiku7/sarama,aybabtme/sarama,pronix/sarama,winlinvip/sarama,vrischmann/sarama,betable/sarama,jepst/sarama,LastManStanding/sarama,jimmykuo/sarama,pronix/sarama