Make registry txt usage more clear

Remove incubator references in README

CRD documentation and sample fixes

* Add RBAC piece of documentation

* Remove `status:` to avoid validation failure

Otherwise it fails with
```
$ kubectl apply -f crd-manifest.yaml
error: error validating "crd-manifest.yaml": error validating data: ValidationError(CustomResourceDefinition.status): missing required field "storedVersions" in io.k8s.apiextensions-apiserver.pkg.apis.apiextensions.v1beta1.CustomResourceDefinitionStatus;
```

Multiple istio ingress gateway

Reworked tutorial for Azure Private DNS

Corrected typo in readme

typo; remove extra space

Fix confusing arrow direction

Add missing bracket in help output

Add missing service account to spec

feat(Azure): support specifying user assigned identity\'s clientID to authenticate

Improve RFC2136 documentation.

Bump the version of golangci-lint

Fix broken link of ingress-gce and ingress-nginx

Azure Private DNS Provider

Delete labeler