Revert "[release-4.21] OCPBUGS-72414: change iperf2 test to serial from parallel"

[liqcui]

Reverts #30673

[openshift-ci-robot]

@liqcui: This pull request references Jira Issue OCPBUGS-72414, which is invalid:

• expected the bug to be in one of the following states: NEW, ASSIGNED, POST, but it is MODIFIED instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

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In response to this:

Reverts #30673

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

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[openshift-merge-robot]

Fix included in accepted release 4.21.0-0.nightly-2026-01-17-030111