Update REBASE.openshift.md

[bertinatto]

Remove git rerere suggestion. This has shown to be problematic in some cases.

/assign @soltysh

[openshift-ci-robot]

@bertinatto: the contents of this pull request could not be automatically validated.

The following commits could not be validated and must be approved by a top-level approver:

• 6cf4ee7|UPSTREAM: : Add OpenShift tooling, images, configs and docs: does not specify an upstream backport in the commit message

Comment /validate-backports to re-evaluate validity of the upstream PRs, for example when they are merged upstream.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci]

@bertinatto: all tests passed!

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[soltysh]

/lgtm
/approve

[soltysh]

/remove-label backports/unvalidated-commits
/label backports/validated-commits

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bertinatto, soltysh

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• DOWNSTREAM_OWNERS [soltysh]

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