Revert "Drop Legacy openshift-test entry point: release-4.20"

[danchild]

#308 errantly dropped the openstack-test binary for 4.20 . A reversion is needed to restore the legacy openshift-test binary.

Reverts commit c1725d5

[openshift-ci]

Skipping CI for Draft Pull Request.
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[danchild]

/assign @mandre

[mandre]

/lgtm
/approve

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[danchild]

/verified by @danchild

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[danchild]

/test test

[danchild]

/test test

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