Support Pulp 3.13, drop earlier versions

[ekohl]

Pulp 3.13 moves to a new wrapper for the worker. This isn't present in older releases so support for them is dropped.

[ekohl]

Needs 3.13 to show up on the mirrors. I'm sure @evgeni is working on this now.

[evgeni]

Which just happened. I re-triggered the jobs.

[ekohl]

To be clear, we should do a minor release before we bump to a major.

[evgeni]

ah, and there is no compatoble 2to3 migration for 3.13 yet.

given it's not used by katello anymore, shall we drop it?

[ekohl]

Won't that break upgrades for users? Recently we had a chat with Tanya on IRC and she said it's being worked on.

[ehelms]

Does 3.13 drop the RQ worker? Or are both provided as options?

[ekohl]

I think the worker script is a wrapper that can call both, depending on the settings. Technically we can introduce a simple shell wrappper in pulpcore 3.11 RPM to remain compatible, but I'm not sure we should take that route.

[evgeni]

Yeah, I think RQ is still the default, but you can make it use something else.

[ehelms]

Do these new workers require any updates to Pulp's selinux policy?

[ekohl]

I don't think they do since this covers both the old and new wrapper.
https://github.com/pulp/pulpcore-selinux/blob/064442e829310e6bab95aa639343a8cfaf90f219/pulpcore.fc#L11

[evgeni]

That's my understanding as well.

I've opened theforeman/pulpcore-packaging#180 to get in the new 2to3 migration plugin, which is compatible with 3.13 in, which should make the tests happy.

[ekohl]

This is now green.