migrate to go modules

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

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

@@ -0,0 +1,31 @@
+package wclayer
+
+import (
+	"github.com/Microsoft/hcsshim/internal/hcserror"
+	"github.com/sirupsen/logrus"
+)
+
+// CreateLayer creates a new, empty, read-only layer on the filesystem based on
+// the parent layer provided.
+func CreateLayer(path, parent string) (err error) {
+	title := "hcsshim::CreateLayer"
+	fields := logrus.Fields{
+		"parent": parent,
+		"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 = createLayer(&stdDriverInfo, path, parent)
+	if err != nil {
+		return hcserror.New(err, title+" - failed", "")
+	}
+	return nil
+}