Update of new_labels.md on a bug and corresponding workaround in OpenShift 4.x

[ka-zo]

A new section is added to new_labels.md on a bug in OpenShift 4.x. The method of updating output image labels during the s2i build process is not possible currently in OpenShift 4.x and a corresponding workaround is described.

[openshift-ci-robot]

Hi @ka-zo. Thanks for your PR.

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[bparees]

/ok-to-test
/lgtm

[bparees]

thanks!

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bparees, ka-zo

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