update vendor

Signed-off-by: Roland.Ma <rolandma@yunify.com>

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

@@ -0,0 +1,30 @@
+package wclayer
+
+import (
+	"github.com/Microsoft/hcsshim/internal/hcserror"
+	"github.com/sirupsen/logrus"
+)
+
+// UnprepareLayer disables the filesystem filter for the read-write layer with
+// the given id.
+func UnprepareLayer(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")
+		}
+	}()
+
+	err = unprepareLayer(&stdDriverInfo, path)
+	if err != nil {
+		return hcserror.New(err, title+" - failed", "")
+	}
+	return nil
+}