🌱 E2E: Add subports to trunked port to test subports deletion

[mquhuy]

This is a continuation of #2081. The idea is to have subports added to trunked port, so that we could verify that subports are deleted with the trunk.

[k8s-ci-robot]

Hi @mquhuy. Thanks for your PR.

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[EmilienM]

/ok-to-test

[jichenjc]

/test pull-cluster-api-provider-openstack-e2e-test

[EmilienM]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: EmilienM

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[MaysaMacedo]

/lgtm