Rename JSONBase -> TypeMeta in preparation for v1beta3

Will make subsequent refactor much easier

plugin/pkg/scheduler/scheduler_test.go

@@ -32,7 +32,7 @@ type fakeBinder struct {
 func (fb fakeBinder) Bind(binding *api.Binding) error { return fb.b(binding) }
 
 func podWithID(id string) *api.Pod {
-	return &api.Pod{JSONBase: api.JSONBase{ID: "foo"}}
+	return &api.Pod{TypeMeta: api.TypeMeta{ID: "foo"}}
 }
 
 type mockScheduler struct {