update kube-ovn to use 1.12

[bobz965]

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/kind api-change
/kind bug
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[k8s-ci-robot]

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• ✅ login: bobz965 / name: bobz965 (6b79651, 5c8d083, 22e1de4, 2b8737a, 344244c, 76aedb2, 313ed48, bc3aa02, f715ed6)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bobz965
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @bobz965. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[yankay]

/ok-to-test

[VannTen]

/uncc