update kube-ovn to use 1.12

[bobz965]

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

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @bobz965. Thanks for your PR.

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[yankay]

/ok-to-test

[VannTen]

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[yankay]

HI @bobz965
The commits need to be Squashed .

[bobz965]

HI @bobz965 The commits need to be Squashed .

done