[oadp-1.1] detect sha256sum is working else use shasum

[openshift-cherrypick-robot]

This is an automated cherry-pick of #793

/assign kaovilai

[kaovilai]

/override ci/prow/4.10-ci-index
/override ci/prow/4.10-images
/override ci/prow/4.10-operator-e2e-aws
/override ci/prow/4.10-operator-e2e-azure
/override ci/prow/4.10-operator-e2e-gcp
/override ci/prow/4.10-operator-unit-test
/override ci/prow/4.9-ci-index
/override ci/prow/4.9-images
/override ci/prow/4.9-operator-e2e-aws
/override ci/prow/4.9-operator-e2e-azure
/override ci/prow/4.9-operator-e2e-gcp
/override ci/prow/4.9-operator-unit-test

[openshift-ci]

@kaovilai: Overrode contexts on behalf of kaovilai: ci/prow/4.10-ci-index, ci/prow/4.10-images, ci/prow/4.10-operator-e2e-aws, ci/prow/4.10-operator-e2e-azure, ci/prow/4.10-operator-e2e-gcp, ci/prow/4.10-operator-unit-test, ci/prow/4.9-ci-index, ci/prow/4.9-images, ci/prow/4.9-operator-e2e-aws, ci/prow/4.9-operator-e2e-azure, ci/prow/4.9-operator-e2e-gcp, ci/prow/4.9-operator-unit-test

In response to this:

/override ci/prow/4.10-ci-index
/override ci/prow/4.10-images
/override ci/prow/4.10-operator-e2e-aws
/override ci/prow/4.10-operator-e2e-azure
/override ci/prow/4.10-operator-e2e-gcp
/override ci/prow/4.10-operator-unit-test
/override ci/prow/4.9-ci-index
/override ci/prow/4.9-images
/override ci/prow/4.9-operator-e2e-aws
/override ci/prow/4.9-operator-e2e-azure
/override ci/prow/4.9-operator-e2e-gcp
/override ci/prow/4.9-operator-unit-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.