Implement a label based discovery for Kafka Dev Service

[cescoffier]

Instead to have to configure the kafka.bootstrap.url, it looks for containers having a specific label and computes the bootstrap server.
Discovery can be disabled in the configuration, and it is only used in dev mode (disabled for test).

@stuartwdouglas we discussed this briefly on the mailing list. It's a draft but works.

TODO:

• update the documentation
• if we decide to go this way, move the label name to a shared class (so every dev service can use it)
• extend configuration to allows configuring the label or value

[sberyozkin]

@cescoffier This looks great and will solve the problem I'm seeing with Dev Services for Keycloak - where a 2nd container is starting if I press Continuous Testing r.

[Ladicek]

I went through several dev services implementations in the last few days and I think we really need a common class that helps implementing a dev service based on a single container. They all have a lot of things in common, but each also has some idiosyncratic differences.

If we had that, it could also handle this label-based sharing.

[cescoffier]

@stuartwdouglas What do you want to do about this one? Should be move forward?
(I will do the rebase later)

[stuartwdouglas]

I think it looks good.

[cescoffier]

Ok, I will rebase , polish a bit and ask for reviews.

[quarkus-bot]

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[stuartwdouglas]

Looks good, just some minor comments.

[cescoffier]

@stuartwdouglas I updated the code to use a specific label for Kafka.

[Ladicek]

Looks good, all my comments are about documentation (and one is about logging).

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[Ladicek]

I know I'm a pain, but looks good now! :-)