Add grpc authority to more closely resemble Kubernetes behaviour

[LucaDev]

What type of PR is this? /kind bug

What this PR does / why we need it: This PR adds a "localhost" authority to the grpc unix-socket connection to more closely resemble Kubernetes real behaviour after: https://github.com/kubernetes/kubernetes/pull/112597 in which it was introduced

Which issue(s) this PR fixes: There are currently no open issues regarding this

Special notes for your reviewer: None

Does this PR introduce a user-facing change?: NONE

Set the grpc authority to "localhost" to mimic Kubernetes behaviour

[linux-foundation-easycla[bot]]

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• :white_check_mark: login: LucaDev / name: Luca Kröger (2f3425f931cf8015e8d996efd2b0757f7a432168)

[pohly]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: LucaDev, pohly

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-csi/csi-test/blob/master/OWNERS)~~ [pohly] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment