enable MTU workaround for dind presets

[sdowell]

This fixes an issue where the dind container is on a host with a MTU lower than the typical default of 1500, resulting in a mismatch.

Upstream maintainers are considering making this the default behavior of the script, but for now this is a quick workaround.

See: https://github.com/kubernetes/test-infra/blob/94f76aedb29b50131fe5dc5e131adcd23f6d4f22/images/bootstrap/runner.sh#L87

[sdowell]

/cc @BenTheElder

[google-oss-prow[bot]]

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In response to [this](https://github.com/GoogleCloudPlatform/oss-test-infra/pull/2323#issuecomment-2234363934): >/cc @BenTheElder > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[google-oss-prow[bot]]

@BenTheElder: changing LGTM is restricted to collaborators

In response to [this](https://github.com/GoogleCloudPlatform/oss-test-infra/pull/2323#pullrequestreview-2184130191): >/lgtm > >TODO: consider making this the default in the script (or something more elaborate that detects MTU and reconfigures docker instead of the iptables hack) Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: michelle192837, sdowell

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[google-oss-prow[bot]]

@sdowell: Updated the config configmap in namespace default at cluster default using the following files:

• key config.yaml using file prow/oss/config.yaml

In response to [this](https://github.com/GoogleCloudPlatform/oss-test-infra/pull/2323): >This fixes an issue where the dind container is on a host with a MTU lower than the typical default of 1500, resulting in a mismatch. > >Upstream maintainers are considering making this the default behavior of the script, but for now this is a quick workaround. > >See: https://github.com/kubernetes/test-infra/blob/94f76aedb29b50131fe5dc5e131adcd23f6d4f22/images/bootstrap/runner.sh#L87 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.