[cinder-csi-plugin]: helm-charts: use /etc/config/ for cloud.conf

[garloff]

[cinder-csi-plugin] helm charts: Use /etc/config/ for cloud.conf
This path is used by default in the deployment manifests for cinder-csi as well as in manifests and helm charts for occm.
It does not matter much until you reference another file via ca-file=/etc/config/cacert
in your cloud.conf and assume that to work.

So better align the volumeMount location everywhere. As there is a canonical location where most artifacts already agree on, let's use it in cinder-csi helm charts as well.

What this PR does / why we need it:
Make the cinder-csi-plugin helm charts work if we pass a secret with cloud.conf and a cacert referenced from there assuming the /etc/config path.
This works with occm (deployment manifests and helm charts) and cinder-csi deployment manifests, but not currently with the cinder-csi helm charts due to using /etc/kubernetes there.
This PR aligns cinder-csi helm charts to also use the canonical path.

Reference:
SovereignCloudStack/cluster-stacks#188 (comment)

Release note:

* [cinder-csi-plugin] Use `/etc/config` in helm charts rather than `/etc/kubernetes` for `cloud.conf`, so any referenced file (e.g. `cacert`) is found.

(Feel free to not add this if determined not to be significant enough.)

[k8s-ci-robot]

Hi @garloff. Thanks for your PR.

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[kayrus]

/lgtm
/approve

[k8s-ci-robot]

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