Added METRIC_TEST_IMAGE var

[evgenLevin]

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[openshift-ci]

@evgenLevin: No Bugzilla bug is referenced in the title of this pull request.
To reference a bug, add 'Bug XXX:' to the title of this pull request and request another bug refresh with /bugzilla refresh.

In response to this:

Added METRIC_TEST_IMAGE var

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: evgenLevin
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[openshift-ci]

Hi @evgenLevin. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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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.

[evgenLevin]

@SchSeba Please take a look at backport of this #47