openapi: Change reference to be first-class

References in the openapi are currently completely hidden from the
model, and just passed through as we walk the tree. The problem is that
they can have a different description and more importantly, different
extensions.

Change them to be first-class citizen, and fully part of the model. It
means that visitors have to implement one more function and decide if
something specific should be done with references. Validation is updated
to just completely ignore them and passthrough (like it was done
before).

pkg/kubectl/cmd/util/openapi/openapi.go

@@ -49,11 +49,13 @@ type Resources interface {
 // - Map is a map of string to one and only one given subtype
 // - Primitive can be string, integer, number and boolean.
 // - Kind is an object with specific fields mapping to specific types.
+// - Reference is a link to another definition.
 type SchemaVisitor interface {
 	VisitArray(*Array)
 	VisitMap(*Map)
 	VisitPrimitive(*Primitive)
 	VisitKind(*Kind)
+	VisitReference(Reference)
 }
 
 // Schema is the base definition of an openapi type.
@@ -219,3 +221,11 @@ func (p *Primitive) GetName() string {
 	}
 	return fmt.Sprintf("%s (%s)", p.Type, p.Format)
 }
+
+// Reference implementation depends on the type of document.
+type Reference interface {
+	Schema
+
+	Reference() string
+	SubSchema() Schema
+}