Update hcsshim to v0.8.9

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/Microsoft/hcsshim/internal/wclayer/unpreparelayer.go

@@ -1,26 +1,21 @@
 package wclayer
 
 import (
+	"context"
+
 	"github.com/Microsoft/hcsshim/internal/hcserror"
-	"github.com/sirupsen/logrus"
+	"github.com/Microsoft/hcsshim/internal/oc"
+	"go.opencensus.io/trace"
 )
 
 // UnprepareLayer disables the filesystem filter for the read-write layer with
 // the given id.
-func UnprepareLayer(path string) (err error) {
+func UnprepareLayer(ctx context.Context, path string) (err error) {
 	title := "hcsshim::UnprepareLayer"
-	fields := logrus.Fields{
-		"path": path,
-	}
-	logrus.WithFields(fields).Debug(title)
-	defer func() {
-		if err != nil {
-			fields[logrus.ErrorKey] = err
-			logrus.WithFields(fields).Error(err)
-		} else {
-			logrus.WithFields(fields).Debug(title + " - succeeded")
-		}
-	}()
+	ctx, span := trace.StartSpan(ctx, title)
+	defer span.End()
+	defer func() { oc.SetSpanStatus(span, err) }()
+	span.AddAttributes(trace.StringAttribute("path", path))
 
 	err = unprepareLayer(&stdDriverInfo, path)
 	if err != nil {