Incorrect url to the swift container

[yadneshk]

Swift path prefix in ReadTree and ReadDir should not be empty
when adding "/" to it.

[k8s-ci-robot]

Hi @yadneshk. Thanks for your PR.

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[yadneshk]

closes #11526

[johngmyers]

/ok-to-test

[johngmyers]

/area provider/openstack

[k8s-ci-robot]

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