User story:

As an OCP user, I want to increase the size of the persistent volume claim after it is created.

Description:

The CSI resize side container is now stable enough to be added to the oVirt CSI driver.

The CSI external-resizer is a sidecar container that watches the Kubernetes API server for PersistentVolumeClaim object edits and triggers ControllerExpandVolume operations against a CSI endpoint if user requested more storage on PersistentVolumeClaim object.

See implementing CSI notes:
- Volume Expansion[1]
- CSI Spec[2]
- Controller Expand (Volume Resize) Secret[3]

Volume Expansion

CSI Spec

Controller Expand (Volume Resize) Secret

** Other platforms CSI Drivers already support resizing the persistent volume.

Acceptance criteria:

- CSI Tests suite passes with `nodeExpansion=true`
- Users can easily expand the PVC they created after creation.
- Everything is deployed by default by the CSI Opearator

Verification steps:

- Create a PVC
- After PVC is created, edit the PVC Object and increase the size
- Check that the PVC disk in RHV is attached and have the correct size.

Repeat the process for each storage class configuration (block, xfs,ext4 ...)

Notes:
See https://kubernetes-csi.github.io/docs/external-resizer.html for more info on the external resizer

[1] https://kubernetes-csi.github.io/docs/volume-expansion.html?highlight=ControllerExpandVolume#volume-expansion
[2] https://github.com/container-storage-interface/spec/blob/master/spec.md
[3] https://kubernetes-csi.github.io/docs/secrets-and-credentials-storage-class.html?highlight=ControllerExpandVolume#controller-expand-volume-resize-secret