resource_printer was not leveraging runtime interfaces

In general, everything in kubectl/* needs to be ignorant of api/* unless
it deals with a concrete type - this change forces resource_printer to
accept interface abstractions (that are already part of kubectl).

pkg/kubectl/sorting_printer_test.go

@@ -20,12 +20,13 @@ import (
 	"reflect"
 	"testing"
 
+	"k8s.io/kubernetes/pkg/api/latest"
 	api "k8s.io/kubernetes/pkg/api/v1"
 	"k8s.io/kubernetes/pkg/runtime"
 )
 
 func encodeOrDie(obj runtime.Object) []byte {
-	data, err := api.Codec.Encode(obj)
+	data, err := runtime.Encode(latest.Codecs.LegacyCodec(api.SchemeGroupVersion), obj)
 	if err != nil {
 		panic(err.Error())
 	}
@@ -223,7 +224,7 @@ func TestSortingPrinter(t *testing.T) {
 		},
 	}
 	for _, test := range tests {
-		sort := &SortingPrinter{SortField: test.field}
+		sort := &SortingPrinter{SortField: test.field, Decoder: latest.Codecs.UniversalDecoder()}
 		if err := sort.sortObj(test.obj); err != nil {
 			t.Errorf("unexpected error: %v (%s)", err, test.name)
 			continue