Refactor common controller functions

[kstrenkova]

This patch removes duplicate code from common controller functions. In the future the code will be easier to maintain thanks to these small changes.

This patch includes:

• GetContainerImage function refactor
• GetPodName function refactor
• Functions moved thanks to being Tempest specific

[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/076a80d3d7ab4b4383ac90d4943221ca

✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 20m 07s
❌ podified-multinode-edpm-deployment-crc-test-operator FAILURE in 2h 08m 52s

[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/35b41a4a32514af5ac78622f13a1f687

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 32m 37s
❌ podified-multinode-edpm-deployment-crc-test-operator FAILURE in 1h 16m 50s

[kstrenkova]

To summarize why I think the patch is okay to merge:

• GetPodName function is working the same as before, you can check that the names are correctly staying the same.
• GetContainerImage function I tested locally and tried all the returns. They were successful.
• Other functions are just moved as Tempest specific or the code from them is used directly and they are removed.

[kstrenkova]

/retest

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adrianfusco, kstrenkova

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