helmchart: allow parameterize storageClass.provisioner

[lizzzcai]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Allow parameterize the storageClass.provisioner in the Helm chart.
When I tested it in our environment, we faced a scaling issue similar to the issue mentioned below. The cluster autoscaler cannot spin up a new node for a pod using the volume provisioned by this storage class. The problem was resolved after overwriting the provionser from kubernetes.io/no-provisioner to another value (workaround mentioned here).

Which issue(s) this PR fixes:

Fixes #288

Special notes for your reviewer:
Manually tested and working fine:

❯ helm template ./helm/provisioner --values custom-values.yaml --dry-run | grep -i storageclass -A 10 | grep provisioner
# Source: local-static-provisioner/templates/storageclass.yaml
    helm.sh/chart: local-static-provisioner-2.0.0
    app.kubernetes.io/name: local-static-provisioner
provisioner: my-provisioner

Release note:

Allow parameterize the storageClass.provisioner in the Helm chart.

[k8s-ci-robot]

Hi @lizzzcai. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[andyzhangx]

/ok-to-test

[lizzzcai]

/retest

[andyzhangx]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, lizzzcai

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