Repair outputs/file test + add use of zcat command to cover LOGSTASH-997
Repair outputs/file test + add use of zcat command to cover LOGSTASH-997

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