[4.x] Add support for static topology configuration for the replication client #445
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The `READONLY` command is sent to replicas as a setup command before the connection is handed to the caller. This command should only be sent to replicas in the cluster mode (see [1]). The sentinel mode didn't use it, but the replication mode did, which is a bug and causes all replicas to be ignored (because the setup command fails). This commit fixes it. [1] https://redis.io/commands/readonly/
- update Testcontainers - add logging configuration, more readable than JUL default
For each Redis deployment style (standalone, replication, sentinel, cluster), there's a class that can be used as a JUnit test rule and internally uses Testcontainers to run Redis. They provide some basic startup guarantees, so users don't need to wait for a server to come online etc. The helper class for standalone Redis allows customizing the Redis version, setting a password, and enabling TLS (including mutual TLS). The multi-node variants assume basic configuration and don't allow customization. These helper classes use the Bitnami images, because they provide environment variables for all the necessary customizations. The multi-node variants also use Docker Compose.
The improvements mostly consist of using the new Redis helper classes for running standalone/replication/sentinel/cluster Redis, instead of the previous approach with a single container for multi-node deployments, which is not realistic and can hide bugs, but there are other improvements too. Notably, the TLS test uses actual Redis TLS support instead of a Vert.x-based TLS proxy, and the multi-node tests verify that data replication actually works. Some useless tests are deleted, too.
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Backport of #444 to
4.x