Use image lists in client tests

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

integration/container_stop_test.go

@@ -22,6 +22,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/containerd/containerd/integration/images"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	runtime "k8s.io/cri-api/pkg/apis/runtime/v1"
@@ -42,7 +43,7 @@ func TestSharedPidMultiProcessContainerStop(t *testing.T) {
 			}()
 
 			var (
-				testImage     = GetImage(BusyBox)
+				testImage     = images.Get(images.BusyBox)
 				containerName = "test-container"
 			)
 
@@ -79,7 +80,7 @@ func TestContainerStopCancellation(t *testing.T) {
 	sb, sbConfig := PodSandboxConfigWithCleanup(t, "sandbox", "cancel-container-stop")
 
 	var (
-		testImage     = GetImage(BusyBox)
+		testImage     = images.Get(images.BusyBox)
 		containerName = "test-container"
 	)