🐛 Fix port-forward failure

[LuBingtan]

What this PR does / why we need it: Fix #332 Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #332

[k8s-ci-robot]

Hi @LuBingtan. Thanks for your PR.

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[wondywang]

/lgtm

[Fei-Guo]

/ok-to-test

[Fei-Guo]

/approve /lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Fei-Guo, LuBingtan

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Needs approval from an approver in each of these files: - ~~[virtualcluster/OWNERS](https://github.com/kubernetes-sigs/cluster-api-provider-nested/blob/main/virtualcluster/OWNERS)~~ [Fei-Guo] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment