Introduce datastructures from committime cleanup

[KevinMGranger]

I'm splitting up #720 into pieces so it's easier to review. This is an unobtrusive change, just copying over datastructures from that PR. (And unit tests for one of them).

Side note: make unit-tests gives me a bunch of ModuleNotFoundError: No module named 'exporters' errors. What gives?

[openshift-ci[bot]]

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[github-actions[bot]]

Test images available! 🧪🚀 To test operator with them, run

operator-sdk run bundle \
quay.io/pelorus/rc-pelorus-operator-bundle:vpr1043-f4e8487 \
--namespace test-pelorus-operator

To clean up environment afterwards, run

operator-sdk cleanup pelorus-operator --namespace test-pelorus-operator

[github-actions[bot]]

Test images available! 🧪🚀 To test operator with them, run

operator-sdk run bundle \
quay.io/pelorus/rc-pelorus-operator-bundle:vpr1043-b5a41bc \
--namespace test-pelorus-operator

To clean up environment afterwards, run

operator-sdk cleanup pelorus-operator --namespace test-pelorus-operator

[openshift-ci[bot]]

@KevinMGranger: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/4.10-e2e-openshift	52c35faa0551e7ab9e740b793844bdf061d11f94	link	true	/test 4.10-e2e-openshift
ci/prow/4.12-e2e-openshift	52c35faa0551e7ab9e740b793844bdf061d11f94	link	true	/test 4.12-e2e-openshift
ci/prow/4.13-e2e-openshift	52c35faa0551e7ab9e740b793844bdf061d11f94	link	true	/test 4.13-e2e-openshift

Full PR test history. Your PR dashboard.

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