Feature Request: Output status code greater than zero when error occurred

[michaelbutler]

Normally, we expect simple utilities to respond with the POSIX exit code 0 on success, and something else (e.g. 1) when an error occurred.

root@871ff6bb412b:/opt/bin# publisher -hostname localhost:4466 -topic test_topic -message "Hello testing kafka" -partition 0
Publishing : Hello testing kafka
To: localhost:4466, topic: test_topic, partition: 0
 ----------------------
2019/06/04 21:35:20 Fatal Error:  dial tcp 127.0.0.1:4466: connect: connection refused
2019/06/04 21:35:20 Sending took: 0.657800 ms
root@871ff6bb412b:/opt/bin# echo $?
0

The utility responds with 0 in the error case.