Refactor volume.Builder.IsReadOnly() to volume.Builder.GetAttributes()

pkg/volume/fc/fc_test.go

@@ -246,7 +246,7 @@ func TestPersistentClaimReadOnlyFlag(t *testing.T) {
 	pod := &api.Pod{ObjectMeta: api.ObjectMeta{UID: types.UID("poduid")}}
 	builder, _ := plug.NewBuilder(spec, pod, volume.VolumeOptions{})
 
-	if !builder.IsReadOnly() {
+	if !builder.GetAttributes().ReadOnly {
 		t.Errorf("Expected true for builder.IsReadOnly")
 	}
 }