📖 Update static book examples to Kubebuilder v3.

[HoustonPutman]

While working on the "Watching" documentation, I noticed that there were other examples in the book that had not yet been updated from v2 to v3.

This PR is pretty simple, and just updating the code differences with starting an empty project using v3.

For the finalizers, I added the RBAC finalizer permission as well, since that is available in v3.

The biggest difference is in emptymain.go, since there is a lot more generated code in v3 than in v2. I can scale the changes back for that file, but it now represents what a user would see when creating a new v3 project.

[k8s-ci-robot]

Hi @HoustonPutman. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Adirio]

/lgtm

Great job

[Adirio]

/ok-to-test

[camilamacedo86]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, HoustonPutman

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[camilamacedo86]

/test pull-kubebuilder-e2e-k8s-1-15-12