Add testing log context

Enables showing debug logs in testing output.
For integration tests the client log output will show
in addition to daemon output, with timestamps for better
correlation.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

content/testsuite/testsuite.go

@@ -31,6 +31,7 @@ import (
 
 	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/log/logtest"
 	"github.com/containerd/containerd/pkg/testutil"
 	digest "github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
@@ -101,6 +102,7 @@ func Name(ctx context.Context) string {
 func makeTest(t *testing.T, name string, storeFn func(ctx context.Context, root string) (context.Context, content.Store, func() error, error), fn func(ctx context.Context, t *testing.T, cs content.Store)) func(t *testing.T) {
 	return func(t *testing.T) {
 		ctx := context.WithValue(context.Background(), nameKey{}, name)
+		ctx = logtest.WithT(ctx, t)
 
 		tmpDir, err := ioutil.TempDir("", "content-suite-"+name+"-")
 		if err != nil {