Fix etcdctl.sh TLS file paths when not using kubeadm.

[RomainMou]

What type of PR is this?
/kind bug

What this PR does / why we need it:
This PR fixes the path of the certificates use in the etcdctl.sh wrapper when the deployment type is not kubeadm.

Which issue(s) this PR fixes:
None

Special notes for your reviewer:
I use the same path as in CLI settings of etcd.env.j2.

Does this PR introduce a user-facing change?:

Fixes the path of the certificates use in the etcdctl.sh wrapper when the deployment type is not kubeadm.

[k8s-ci-robot]

Hi @RomainMou. Thanks for your PR.

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[yankay]

/ok-to-test

[floryut]

@RomainMou Thank you for the PR 🥳

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, RomainMou

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[yankay]

Thanks
/lgtm