Add 'message' support for configuring the message output to stdout
Add 'message' support for configuring the message output to stdout

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