Fix crds to add defaults for k8s 1.18+

[jkleckner]

PR #1045 [1] appears to have accidentally reverted #986 [2] which added
defaults to the protocol field to work with versions of k8s 1.18+

This PR also draws on kudobuilder/operators#297 [3]

[1] #1045

[2] #986

[3] kudobuilder/operators#297

[ordukhanian]

Hello,
Could you please release a new version of GCP Operator with this fix?
We are using the previous helm chart which is now deprecated, and would like to upgrade.

[jkleckner]

In the meantime, you can clone the repo and install using something like (adjust namespaces to your liking).
Because of functional changes,
I actually think that the 0.8.6 chart version might also make sense to bundle in the repo.

helm \
  install \
  spark-operator \
  /path-to-your-clone/github.com/GoogleCloudPlatform/spark-on-k8s-operator/charts/spark-operator-chart \
  --namespace spark-operator \
  --set        sparkJobNamespace=spark \
  --set        enableWebhook=true \
  --set        webhook.enable=true \
  --set        webhookPort=443 \
  --set-string enableMetrics=true