v2: Rename storage class labels reclaimPolicy to reclaim_policy and volumeBindingMode to volume_binding_mode

[Dingshujie]

What this PR does / why we need it:
Rename storage class labels reclaimPolicy to reclaim_policy and volumeBindingMode to volume_binding_mode
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #981

[k8s-ci-robot]

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[lilic]

/hold

until the release.

[lilic]

Thanks for this, this looks good, lets just wait until after the release to merge.

[lilic]

A bit odd that CI did not catch this, but do you mind updating the docs for this as well, thanks!

https://github.com/kubernetes/kube-state-metrics/blob/master/docs/storageclass-metrics.md

[lilic]

@Dingshujie friendly ping :) thanks!

[olivierlemasle]

/close
Done with #1107

[k8s-ci-robot]

@olivierlemasle: Closed this PR.

In response to this:

/close

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