Add CSI secret templates as annotation in Provisioned PV #654
Description
There was a discussion in the meeting on PVC/Snapshot transfer about the model that operation on PV should not rely on information in StorageClass after PV is provisioned. The reason for it is that StorageClass can be changed after the PV is provisioned, as a result, the controllers might not rely on the current information in StorageClass.
In the case of PVC transfer, SecretRef in PV may be modified based on the templates after transferred. Therefore, these templates should be kept in PV as annotations.