Minimize list of supported OpenShift versions

[eric-nadeau]

Describe the solution you'd like

Kanister seems to support OpenShift 3.11, 4.4, 4.5 and 4.10.

Would it make sense to support only the latest of every supported major version? As of this writing this would mean only 3.11 and 4.10.

Care should be taken to consider all consumers of Kanister.

Additional context

As suggested here: #1499 (comment)

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[pavannd1]

Valid

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[naumvd95]

I'd vote for the last 4 versions rotational support, i.e. currently it is 4.11,4.12,4.13,4.14