Add Exoscale to the CSI drivers list

[pierre-emmanuelJ]

Add the Exoscale driver to the list of CSI drivers.

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[xing-yang]

Please squash the commits.

[xing-yang]

/release-note-none

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pierre-emmanuelJ, xing-yang

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