Revert "Use IPVS is 5k-node scalability test"

[mborsz]

Reverts #9076

ipvs is not supported in cos image we are using and this breaks our 5k node test.

[mborsz]

/assign @shyamjvs

[mborsz]

See kubernetes/kubernetes#67644 (comment) for context

[shyamjvs]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mborsz, shyamjvs

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[k8s-ci-robot]

@mborsz: Updated the job-config configmap using the following files:

• key sig-scalability-config.yaml using file config/jobs/kubernetes/sig-scalability/sig-scalability-config.yaml

In response to this:

Reverts #9076

ipvs is not supported in cos image we are using and this breaks our 5k node test.

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