Refactor Hash.fetch usage to provide default values
Refactor Hash.fetch usage to provide default values

Rather than explicitly running through if/else blocks, it's easier to
read if the default value is provided against the Hash method calls directly.

opentable/logstash-kafka,joekiller/logstash-kafka,Aloomaio/logstash-kafka,joekiller/logstash-kafka,tinglinux/logstash-kafka,Aloomaio/logstash-kafka,tinglinux/logstash-kafka,opentable/logstash-kafka