Switch testcloud plugin to the Workarounds API

[frantisekz]

This will allow to:

• expose a proper API to share commands to be executed during boot/cloud-init between tmt and testcloud, and customize them tmt-side
• open way to address Possible race condition in the testcloud plugin #2687 in an atomic way
• open way to address Add virtiofs to tmt provision local qemu #2348

Requires https://pagure.io/testcloud/pull-request/173 ; built in https://copr.fedorainfracloud.org/coprs/frantisekz/testcloud-wip/build/7630902/

Known issues so far:

• el9 host doesn't work - resolved
• TBD

This is meant also as a RFC for the api itself, source and available methods can be seen at https://pagure.io/testcloud/blob/284f136fcbca4e9166d687e90f0108962c1bc8f1/f/testcloud/workarounds.py

[psss]

• open way to address Possible race condition in the testcloud plugin #2687 in an atomic way

That would be nice, seems the problem still randomly appears. Here's a recent job for example. If possible, let's try to finish this in 1.36?

[frantisekz]

• open way to address Possible race condition in the testcloud plugin #2687 in an atomic way

That would be nice, seems the problem still randomly appears. Here's a recent job for example. If possible, let's try to finish this in 1.36?

I'd consider this one ready now, I've finished the integration part in testcloud - if it's okay with the one TODO item left, I'd go ahead and merge the changes testcloud side, release a new testcloud, and then this could get merged.

For testing - testcloud -800 is being built at https://copr.fedorainfracloud.org/coprs/frantisekz/testcloud-wip/builds/ .

[frantisekz]

@psss @martinhoyer @happz This one can now land into 1.35 if possible.

[seberm]

I've tested the changes only locally with testcloud==0.9.13 and it seems everything is working fine.

[psss]

Looks nice! Thanks for the improvement.