[test_operator] Common default values for container images

[eduolivares]

test-operator currently supports 4 test frameworks: tempest, tobiko, horizontests and ansibletests. The relevant variables required to download their corresponding container images had to be configured separately, but usually were configured with common values. With this PR, default values for registry, namespace and tag can be configured and they apply to the 4 test frameworks.

[github-actions]

Thanks for the PR! ❤️
I'm marking it as a draft, once your happy with it merging and the PR is passing CI, click the "Ready for review" button below.

[lpiwowar]

@eduolivares if we want to keep this in the defaults can you update the README.md please?

Otherwise looks good to me!:) 👍

[lpiwowar]

Also, cc @eshulman2

Do you think Ella this will break your PR? -> #2374

I think we should wait with merging this before Ella tells us her opinion.

[eduolivares]

Also, cc @eshulman2

Do you think Ella this will break your PR? -> #2374

I think we should wait with merging this before Ella tells us her opinion.

I have taken a look at #2374 and wow, it's a big change.
However, I think #2594 won't affect much to it. Because #2374 will resolve any conflicts during task "Overwrite global_vars with stage_vars".
But, yes, let's see what @eshulman2 thinks before approving #2594

[lpiwowar]

Looks good to me! 👍

Only one small change request in the README as the newly introduced parameters cifmw_test_operator_default_* can not be overridden inside of cifmw_test_operator_stages.

[lpiwowar]

Looks good to me! 👍

[lpiwowar]

/lgtm

[pablintino]

/approve

[openshift-ci]

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/e1ced0240524448ab8cda3263320b790

✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 14m 52s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 20m 47s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 1h 31m 26s
❌ cifmw-multinode-tempest FAILURE in 1h 44m 21s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 00s
✔️ cifmw-pod-pre-commit SUCCESS in 7m 50s
✔️ build-push-container-cifmw-client SUCCESS in 37m 48s
✔️ cifmw-molecule-test_operator SUCCESS in 3m 33s

[lpiwowar]

recheck