Modern Sentry stacks uses Kafka to transfer messages, and ZooKepper
to coordinate Kafka instances.

Kafka topics are created 20 seconds after startup if not done in the past.
A feature flag file .topics_initialized is created to indicate it's done.

Ref T1791.

• Deploy on docker-002
• Check connectivity done between Zookeeper and Kafka with docker logs
• Check topics with kafka-topics --list --bootstrap-server localhost:9092