[common] Use a config dict for configuring tests

[elfiesmelfie]

Allow a list of key/value pairs to be passed to configure the tests.
This allows for passing test configs that don't share all common attributes e.g. run the pod tests to check multiple namespaces in one go

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/def8879ccb4f4b1d9e63334c36d12319

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 53m 33s
✔️ functional-tests-on-osp18 SUCCESS in 1h 40m 08s
❌ functional-logging-tests-osp18 FAILURE in 1h 03m 33s
✔️ functional-graphing-tests-osp18 SUCCESS in 1h 02m 39s
✔️ functional-metric-verification-tests-osp18 SUCCESS in 1h 07m 17s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 07m 42s
❌ functional-tests-on-osp18 FAILURE in 1h 52m 25s
✔️ functional-logging-tests-osp18 SUCCESS in 1h 09m 21s
❌ functional-graphing-tests-osp18 FAILURE in 1h 03m 56s
✔️ functional-metric-verification-tests-osp18 SUCCESS in 1h 05m 59s

[elfiesmelfie]

recheck

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/843178256163473f92523ac0c1265cd8

✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 01m 11s
❌ functional-tests-on-osp18 FAILURE in 1h 47m 58s
✔️ functional-logging-tests-osp18 SUCCESS in 1h 00m 50s
❌ functional-graphing-tests-osp18 FAILURE in 1h 02m 32s
✔️ functional-metric-verification-tests-osp18 SUCCESS in 1h 03m 11s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 10m 46s
❌ functional-tests-on-osp18 FAILURE in 1h 56m 35s
✔️ functional-logging-tests-osp18 SUCCESS in 1h 08m 08s
❌ functional-graphing-tests-osp18 FAILURE in 1h 07m 49s
✔️ functional-metric-verification-tests-osp18 SUCCESS in 1h 09m 31s

[softwarefactory-project-zuul]

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✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 11m 19s
❌ functional-autoscaling-tests-osp18 FAILURE in 1h 54m 47s
❌ functional-logging-tests-osp18 FAILURE in 1h 21m 32s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 28m 01s
❌ functional-autoscaling-tests-osp18 TIMED_OUT in 3h 12m 59s
❌ functional-logging-tests-osp18 FAILURE in 1h 38m 39s

[softwarefactory-project-zuul]

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✔️ telemetry-openstack-meta-content-provider-master SUCCESS in 2h 19m 45s
❌ functional-tests-osp18 FAILURE in 1h 59m 41s
❌ functional-logging-tests-osp18 FAILURE in 1h 13m 31s

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✔️ telemetry-openstack-meta-content-provider-master SUCCESS in 2h 22m 47s
❌ functional-chargeback-tests-osp18 FAILURE in 1h 15m 42s
❌ functional-tests-osp18 FAILURE in 2h 01m 52s
❌ functional-logging-tests-osp18 FAILURE in 1h 16m 17s