Some tests to be executed while developing Kafka extensions for Envoy.
Should be merged into Envoy build process, but that would require considerable (I think) Bazel knowledge and effort.
Dependencies:
- Kafka server has to be listening on 9092 and advertise itself on 19092,
- Envoy has to listen on 19092 and forward to Kafka's 9092,
- Envoy exposes metrics on 9901,
- tests should be executed against clean installation (we don't want to have any records in topics, as they might break tests).