Add OpenShift Optional category

[jotak]

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[openshift-ci]

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[jotak]

/retest

[openshift-ci]

@jotak: The following test 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/e2e-operator	2164adc	link	false	/test e2e-operator

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