Move to use github.com/containerd/log

Add github.com/containerd/log to go.mod

Signed-off-by: Derek McGowan <derek@mcg.dev>

snapshots/devmapper/pool_device_test.go

@@ -26,10 +26,10 @@ import (
 	"testing"
 	"time"
 
-	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/mount"
 	"github.com/containerd/containerd/pkg/testutil"
 	"github.com/containerd/containerd/snapshots/devmapper/dmsetup"
+	"github.com/containerd/log"
 	"github.com/docker/go-units"
 	"github.com/stretchr/testify/assert"
 	exec "golang.org/x/sys/execabs"