Support csi.storage.k8s.io/fstype key in StorageClass parameters

[tksm]

Describe the solution you'd like

I would like to use csi.storage.k8s.io/fstype key instead of fsType in StorageClass parameters since fsType key has been deprecated since csi-provisioner v1.0.1.

It seems that the current Trident (v21.04.1) does not allow unexpected parameters in StorageClass. When I set csi.storage.k8s.io/fstype in StorageClass, I get the following error in the Trident log.

time="2021-07-02T06:52:18Z" level=error msg="K8S helper could not process the storage class attribute csi.storage.k8s.io/fstype" error="unrecognized storage attribute: csi.storage.k8s.io/fstype" name=ontap-block parameters="map[backendType:ontap-san csi.storage.k8s.io/fstype:ext4]" provisioner=csi.trident.netapp.io requestID=8fbfe6cb-fe57-43fd-9604-62960c51daf2 requestSource=Kubernetes

Additional context

I set fsType for fixing #454 (comment) .

[gnarl]

This enhancement request is addressed with commit e9901c2 and will be included in the Trident v22.04 release.