Allow defining CRDs from a single version

Part of istio#3127. Goes with a
corresponding tools change; this will fail until that merges.

This just shows DR. The tool will support both the new and old way (we
can remove the old way if we want), so we don't have to move everything
at once. We will, though. I kept it to one so its easy to review first.

networking/v1/destination_rule.proto

@@ -103,21 +103,6 @@ option go_package = "istio.io/api/networking/v1";
 // DestinationRule defines policies that apply to traffic intended for a service
 // after routing has occurred.
 //
-// <!-- crd generation tags
-// +cue-gen:DestinationRule:groupName:networking.istio.io
-// +cue-gen:DestinationRule:version:v1
-// +cue-gen:DestinationRule:annotations:helm.sh/resource-policy=keep
-// +cue-gen:DestinationRule:labels:app=istio-pilot,chart=istio,heritage=Tiller,release=istio
-// +cue-gen:DestinationRule:subresource:status
-// +cue-gen:DestinationRule:scope:Namespaced
-// +cue-gen:DestinationRule:resource:categories=istio-io,networking-istio-io,shortNames=dr
-// +cue-gen:DestinationRule:printerColumn:name=Host,type=string,JSONPath=.spec.host,description="The name of a service from the service registry"
-// +cue-gen:DestinationRule:printerColumn:name=Age,type=date,JSONPath=.metadata.creationTimestamp,description="CreationTimestamp is a timestamp
-// representing the server time when this object was created. It is not guaranteed to be set in happens-before order across separate operations.
-// Clients may not set this value. It is represented in RFC3339 form and is in UTC.
-// Populated by the system. Read-only. Null for lists. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata"
-// +cue-gen:DestinationRule:preserveUnknownFields:false
-// -->
 //
 // <!-- go code generation tags
 // +kubetype-gen

networking/v1alpha3/destination_rule.proto

@@ -129,7 +129,7 @@ option go_package = "istio.io/api/networking/v1alpha3";
 //
 // <!-- crd generation tags
 // +cue-gen:DestinationRule:groupName:networking.istio.io
-// +cue-gen:DestinationRule:version:v1alpha3
+// +cue-gen:DestinationRule:versions:v1beta1,v1alpha3,v1
 // +cue-gen:DestinationRule:annotations:helm.sh/resource-policy=keep
 // +cue-gen:DestinationRule:labels:app=istio-pilot,chart=istio,heritage=Tiller,release=istio
 // +cue-gen:DestinationRule:subresource:status

networking/v1beta1/destination_rule.proto

@@ -103,23 +103,6 @@ option go_package = "istio.io/api/networking/v1beta1";
 // DestinationRule defines policies that apply to traffic intended for a service
 // after routing has occurred.
 //
-// <!-- crd generation tags
-// +cue-gen:DestinationRule:groupName:networking.istio.io
-// +cue-gen:DestinationRule:version:v1beta1
-// +cue-gen:DestinationRule:storageVersion
-// +cue-gen:DestinationRule:annotations:helm.sh/resource-policy=keep
-// +cue-gen:DestinationRule:labels:app=istio-pilot,chart=istio,heritage=Tiller,release=istio
-// +cue-gen:DestinationRule:subresource:status
-// +cue-gen:DestinationRule:scope:Namespaced
-// +cue-gen:DestinationRule:resource:categories=istio-io,networking-istio-io,shortNames=dr
-// +cue-gen:DestinationRule:printerColumn:name=Host,type=string,JSONPath=.spec.host,description="The name of a service from the service registry"
-// +cue-gen:DestinationRule:printerColumn:name=Age,type=date,JSONPath=.metadata.creationTimestamp,description="CreationTimestamp is a timestamp
-// representing the server time when this object was created. It is not guaranteed to be set in happens-before order across separate operations.
-// Clients may not set this value. It is represented in RFC3339 form and is in UTC.
-// Populated by the system. Read-only. Null for lists. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata"
-// +cue-gen:DestinationRule:preserveUnknownFields:false
-// -->
-//
 // <!-- go code generation tags
 // +kubetype-gen
 // +kubetype-gen:groupVersion=networking.istio.io/v1beta1