Remove extra injected environment variables.

[gianlucaborello]

Hi

In my setup, in certain circumstances I need to use the mysql-agent standalone, that is without relying on the operator.

This means that I have to manually create the manifests for the MySQL StatefulSet and Service, so it's in my best interest to keep those as clean as possible.

While doing the translation, I noticed that there seem to be a few environment variables that are injected into the containers but are not used. In particular:

• MYSQL_CLUSTER_SERVICE_NAME is injected but I can't find in the whole history of the project a revision in which it was ever used.

• MYSQL_CLUSTER_NAME, POD_NAMESPACE, REPLICATION_GROUP_SEEDS, MYSQL_CLUSTER_MULTI_MASTER are injected into the mysql container, but I can't find a reason for doing so since that's the standard mysql container which doesn't understand those variables, and it's the agent container that needs to consume them.

Were they left there in order to be used by a human operator to have better introspection into the components, or are they just a relic from the past? In my tests, everything works fine without injecting them (in my redacted manifests), but please keep in mind I haven't tested the backup/restore logic.

Thanks

[prydie]

Yep, these are artefacts of the initial implementation and at least one mistake. Change LGTM.