Update Vendor

(*) github.com/Microsoft/hcsshim
    (*) golang.org/x/sys
    (*) github.com/x/cyrpto
    (*) github.com/sirupsen/logrus
    (*) github.com/Microsoft/go-winio
    (*) github.com/juju/errors
    (*) github.com/buger/jsonparser

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

@@ -0,0 +1,49 @@
+package wclayer
+
+import (
+	"syscall"
+
+	"github.com/Microsoft/hcsshim/internal/hcserror"
+	"github.com/sirupsen/logrus"
+)
+
+// GetLayerMountPath will look for a mounted layer with the given path and return
+// the path at which that layer can be accessed.  This path may be a volume path
+// if the layer is a mounted read-write layer, otherwise it is expected to be the
+// folder path at which the layer is stored.
+func GetLayerMountPath(path string) (string, error) {
+	title := "hcsshim::GetLayerMountPath "
+	logrus.Debugf(title+"path %s", path)
+
+	var mountPathLength uintptr
+	mountPathLength = 0
+
+	// Call the procedure itself.
+	logrus.Debugf("Calling proc (1)")
+	err := getLayerMountPath(&stdDriverInfo, path, &mountPathLength, nil)
+	if err != nil {
+		err = hcserror.Errorf(err, title, "(first call) path=%s", path)
+		logrus.Error(err)
+		return "", err
+	}
+
+	// Allocate a mount path of the returned length.
+	if mountPathLength == 0 {
+		return "", nil
+	}
+	mountPathp := make([]uint16, mountPathLength)
+	mountPathp[0] = 0
+
+	// Call the procedure again
+	logrus.Debugf("Calling proc (2)")
+	err = getLayerMountPath(&stdDriverInfo, path, &mountPathLength, &mountPathp[0])
+	if err != nil {
+		err = hcserror.Errorf(err, title, "(second call) path=%s", path)
+		logrus.Error(err)
+		return "", err
+	}
+
+	mountPath := syscall.UTF16ToString(mountPathp[0:])
+	logrus.Debugf(title+"succeeded path=%s mountPath=%s", path, mountPath)
+	return mountPath, nil
+}