Revert "OCPBUGS-70170: change iperf2 test to serial from parallel"

[liqcui]

Reverts #30671

[openshift-ci-robot]

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[openshift-ci-robot]

@liqcui: This pull request references Jira Issue OCPBUGS-70170, which is invalid:

• expected the bug to be in one of the following states: NEW, ASSIGNED, POST, but it is Verified 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 #30671

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

Scheduling required tests:
/test e2e-aws-csi
/test e2e-aws-ovn-fips
/test e2e-aws-ovn-microshift
/test e2e-aws-ovn-microshift-serial
/test e2e-aws-ovn-serial-1of2
/test e2e-aws-ovn-serial-2of2
/test e2e-gcp-csi
/test e2e-gcp-ovn
/test e2e-gcp-ovn-upgrade
/test e2e-metal-ipi-ovn-ipv6
/test e2e-vsphere-ovn
/test e2e-vsphere-ovn-upi

[openshift-ci]

@liqcui: all tests passed!

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