generate fully qualified type references

Currently type references for non-local names are output as relative
types which is subject to the resolution rules as defined at
https://protobuf.com/docs/language-spec#reference-resolution
This works fine within the k8s.io namespace where no subpackages are
named k8s, but other users of go-to-protobuf likely have k8s in their
package name. This causes conflicts in the search resolution when
executing `go-to-protobuf`:

```
company.example.com/k8s/custom/pkg/apis/custom.k8s.example.com/v1/generated.proto:64:12: "k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta" is resolved to "company.example.com.k8s.custom.pkg.apis.custom.k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta", which is not defined. The innermost scope is searched first in name resolution. Consider using a leading '.'(i.e., ".k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta") to start from the outermost scope.
```

To avoid this we can output fully qualified type references using a
preceding dot (.)

This results in a change for k8s generated.proto files, but the
effect is a noop.

Fixes kubernetes/code-generator#147

Signed-off-by: Andrew DeMaria <ademaria@cloudflare.com>

Kubernetes-commit: 9edf1fc51c56d565348c48f3765cf094518ba7ed

pkg/apis/audit/v1/generated.proto

@@ -48,11 +48,11 @@ message Event {
   optional string verb = 5;
 
   // Authenticated user information.
-  optional k8s.io.api.authentication.v1.UserInfo user = 6;
+  optional .k8s.io.api.authentication.v1.UserInfo user = 6;
 
   // Impersonated user information.
   // +optional
-  optional k8s.io.api.authentication.v1.UserInfo impersonatedUser = 7;
+  optional .k8s.io.api.authentication.v1.UserInfo impersonatedUser = 7;
 
   // Source IPs, from where the request originated and intermediate proxies.
   // The source IPs are listed from (in order):
@@ -79,28 +79,28 @@ message Event {
   // For successful responses, this will only include the Code and StatusSuccess.
   // For non-status type error responses, this will be auto-populated with the error Message.
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.Status responseStatus = 10;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.Status responseStatus = 10;
 
   // API object from the request, in JSON format. The RequestObject is recorded as-is in the request
   // (possibly re-encoded as JSON), prior to version conversion, defaulting, admission or
   // merging. It is an external versioned object type, and may not be a valid object on its own.
   // Omitted for non-resource requests.  Only logged at Request Level and higher.
   // +optional
-  optional k8s.io.apimachinery.pkg.runtime.Unknown requestObject = 11;
+  optional .k8s.io.apimachinery.pkg.runtime.Unknown requestObject = 11;
 
   // API object returned in the response, in JSON. The ResponseObject is recorded after conversion
   // to the external type, and serialized as JSON.  Omitted for non-resource requests.  Only logged
   // at Response Level.
   // +optional
-  optional k8s.io.apimachinery.pkg.runtime.Unknown responseObject = 12;
+  optional .k8s.io.apimachinery.pkg.runtime.Unknown responseObject = 12;
 
   // Time the request reached the apiserver.
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime requestReceivedTimestamp = 13;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime requestReceivedTimestamp = 13;
 
   // Time the request reached current audit stage.
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime stageTimestamp = 14;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime stageTimestamp = 14;
 
   // Annotations is an unstructured key value map stored with an audit event that may be set by
   // plugins invoked in the request serving chain, including authentication, authorization and
@@ -115,7 +115,7 @@ message Event {
 // EventList is a list of audit Events.
 message EventList {
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;
 
   repeated Event items = 2;
 }
@@ -187,7 +187,7 @@ message ObjectReference {
 message Policy {
   // ObjectMeta is included for interoperability with API infrastructure.
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
 
   // Rules specify the audit Level a request should be recorded at.
   // A request may match multiple rules, in which case the FIRST matching rule is used.
@@ -215,7 +215,7 @@ message Policy {
 // PolicyList is a list of audit Policies.
 message PolicyList {
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;
 
   repeated Policy items = 2;
 }

pkg/apis/example/v1/generated.proto

@@ -33,7 +33,7 @@ message Pod {
   // Standard object's metadata.
   // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
 
   // Specification of the desired behavior of the pod.
   // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
@@ -62,11 +62,11 @@ message PodCondition {
 
   // Last time we probed the condition.
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastProbeTime = 3;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.Time lastProbeTime = 3;
 
   // Last time the condition transitioned from one status to another.
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 4;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 4;
 
   // Unique, one-word, CamelCase reason for the condition's last transition.
   // +optional
@@ -82,7 +82,7 @@ message PodList {
   // Standard list metadata.
   // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;
 
   // List of pods.
   // More info: http://kubernetes.io/docs/user-guide/pods
@@ -206,6 +206,6 @@ message PodStatus {
   // RFC 3339 date and time at which the object was acknowledged by the Kubelet.
   // This is before the Kubelet pulled the container image(s) for the pod.
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time startTime = 7;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.Time startTime = 7;
 }
 

pkg/apis/example2/v1/generated.proto

@@ -34,7 +34,7 @@ message ReplicaSet {
   // be the same as the Pod(s) that the ReplicaSet manages.
   // Standard object's metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
   // +optional
-  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
+  optional .k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
 
   // Spec defines the specification of the desired behavior of the ReplicaSet.
   // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status