Fix: dns bug for endpointslices v1beta1 version

[LaurenceLiZhixin]

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[codecov]

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  Hits                            ?     6552           
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unittests	47.83% <0.00%> (?)

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[Congrool]

Could you please also create an issue to trace the problem? Since it will not be totally sovled in this pr.

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: LaurenceLiZhixin, rambohe-ch

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