Use image lists in client tests

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

integration/duplicate_name_test.go

@@ -19,6 +19,7 @@ package integration
 import (
 	"testing"
 
+	"github.com/containerd/containerd/integration/images"
 	"github.com/stretchr/testify/require"
 )
 
@@ -30,12 +31,12 @@ func TestDuplicateName(t *testing.T) {
 	_, err := runtimeService.RunPodSandbox(sbConfig, *runtimeHandler)
 	require.Error(t, err)
 
-	EnsureImageExists(t, pauseImage)
+	EnsureImageExists(t, images.PauseImage)
 
 	t.Logf("Create a container")
 	cnConfig := ContainerConfig(
 		"container",
-		pauseImage,
+		images.PauseImage,
 	)
 	_, err = runtimeService.CreateContainer(sb, cnConfig, sbConfig)
 	require.NoError(t, err)