[release-v1.10] Make SecretSpec field of consumers Auth optional

[openshift-cherrypick-robot]

This is an automated cherry-pick of #780

/assign mgencur

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@openshift-cherrypick-robot: 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/412-test-reconciler-aws-ocp-412	8a73c2b	link	true	/test 412-test-reconciler-aws-ocp-412

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