Make CSI secret handling logic reusable

[mkimuram]

CSI secret can be defined as a template as defined here. Current implementation of external-provisioner embeds this logic in the controller codes as private scoped, which isn't reusable from other controllers.

There are use cases, like PVC transfer and secret protection, to use this logic from other controllers, therefore it needs to be changed to public scoped and move to a kind of util packages.

[mkimuram]

@msau42 @jsafrane

Do you have preference on where the codes should move to?
Is pkg/util in this repo OK or should it be util package in somewhere like https://github.com/kubernetes-sigs/sig-storage-lib-external-provisioner ?

[mkimuram]

Snapshotter codes seem to share the similar logic with different keys. It looks cleaner to move it to a separate repo. Any thought?

[msau42]

https://github.com/kubernetes-csi/csi-lib-utils is the place we've been putting libraries shared by multiple components

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closing this issue.

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/close

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