Add name generation and normalize common create flows

Adds `ObjectMeta.GenerateName`, an optional string field that defines
name generation behavior if a Name is not provided.

Adds `pkg/api/rest`, which defines the default Kubernetes API pattern
for creation (and will cover update as well). Will allow registries
and REST objects to be merged by moving logic on api out of those places.

Add `pkg/api/rest/resttest`, which will be the test suite that verifies
a RESTStorage object follows the Kubernetes API conventions and begin
reducing our duplicated tests.

pkg/api/meta.go

@@ -17,6 +17,8 @@ limitations under the License.
 package api
 
 import (
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/conversion"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 )
 
@@ -24,6 +26,7 @@ import (
 func FillObjectMetaSystemFields(ctx Context, meta *ObjectMeta) {
 	meta.CreationTimestamp = util.Now()
 	meta.UID = util.NewUUID()
+	meta.SelfLink = ""
 }
 
 // HasObjectMetaSystemFieldValues returns true if fields that are managed by the system on ObjectMeta have values.
@@ -31,3 +34,17 @@ func HasObjectMetaSystemFieldValues(meta *ObjectMeta) bool {
 	return !meta.CreationTimestamp.Time.IsZero() ||
 		len(meta.UID) != 0
 }
+
+// GetObjectMetaPtr returns a pointer to a provided object's ObjectMeta.
+// TODO: allow runtime.Unknown to extract this object
+func ObjectMetaFor(obj runtime.Object) (*ObjectMeta, error) {
+	v, err := conversion.EnforcePtr(obj)
+	if err != nil {
+		return nil, err
+	}
+	var objectMeta *ObjectMeta
+	if err := runtime.FieldPtr(v, "ObjectMeta", &objectMeta); err != nil {
+		return nil, err
+	}
+	return objectMeta, nil
+}