Addon: Collect logs to Kafka topic

[solsson]

Note that unlike #39 we don't want a test consumer in this addon, becauase it would cause an infinite loop of logging. Use kubectl exec to some kafka(cat) container with a console consumer.

Currently two blockers:

• tail -f *.log won't discover new files
• can't use the filename headers from tail -f as delimiters because kafkacat supports only single char delimiters.

Maybe a dedicated tool like fluent-bit is required for proper log folder processing.

[solsson]

Other interesting approaches:

• Add example of kafka-rest fluent/fluent-bit-kubernetes-logging#6
• https://github.com/solsson/dockerfiles/tree/master/connect-files

[solsson]

The "raw" collector got a huge improvement for #84 in da19538 and 8528f0b.

[solsson]

Keeping this addon open for 2.x users, but I think the way forward is #131.

[solsson]

Keeping this addon open for 2.x users, but I think the way forward is #131.

And there's Loki.