ReadyToUse in Snapshot will be updated based on ReadyToUse in Content.
ReadytoUse in Snapshot will also be updated when caller indicates it should
be changed to false when an error occurrs.
https://github.com/kubernetes/enhancements/blob/master/keps/sig-storage/177-volume-snapshot/tighten-validation-webhook-crd.md
1. Ratcheting validation webhook server image
2. Controller labels invalid objects
3. Unit tests for webhook
4. Deployment README and example deployment method with certs
5. Update top-level README
Racheting validation:
1. webhook is strict on create
2. webhook is strict on updates where the existing object passes strict validation
3. webhook is relaxed on updates where the existing object fails strict validation (allows finalizer removal, status update, deletion, etc)
Additionally the validating wehook server will perform immutability
checks on scenario 2 above.
Irrespective of any error on the Volume Snapshot
object, initiate dynamic VolumeSnapshotContent object
creation. If any required parameters are not found, (e.g. missing
VS class), the VS content object creation would fail gracefully.
