Make runtime opt in to deepcopy

This minimizes the number of functions generated.  It also breaks the chain of
symbol dependencies to pkg/conversion, so we can remove now-unreferenced
(previously unused but referenced) conversion deep-copies.

pkg/runtime/types.go

@@ -40,6 +40,7 @@ import (
 // TypeMeta is provided here for convenience. You may use it directly from this package or define
 // your own with the same fields.
 //
+// +k8s:deepcopy-gen=true
 // +protobuf=true
 type TypeMeta struct {
 	APIVersion string `json:"apiVersion,omitempty" yaml:"apiVersion,omitempty" protobuf:"bytes,1,opt,name=apiVersion"`
@@ -92,6 +93,7 @@ const (
 // in the Object. (TODO: In the case where the object is of an unknown type, a
 // runtime.Unknown object will be created and stored.)
 //
+// +k8s:deepcopy-gen=true
 // +protobuf=true
 type RawExtension struct {
 	// Raw is the underlying serialization of this object.
@@ -109,6 +111,7 @@ type RawExtension struct {
 // TODO: Make this object have easy access to field based accessors and settors for
 // metadata and field mutatation.
 //
+// +k8s:deepcopy-gen=true
 // +protobuf=true
 type Unknown struct {
 	TypeMeta `json:",inline" protobuf:"bytes,1,opt,name=typeMeta"`