resume pulling the layer on disconnect

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)

server/server.go

@@ -1137,7 +1137,7 @@ func (srv *Server) pullImage(r *registry.Registry, out io.Writer, imgID, endpoin
 					status = fmt.Sprintf("Pulling fs layer [retries: %d]", j)
 				}
 				out.Write(sf.FormatProgress(utils.TruncateID(id), status, nil))
-				layer, err := r.GetRemoteImageLayer(img.ID, endpoint, token)
+				layer, err := r.GetRemoteImageLayer(img.ID, endpoint, token, int64(imgSize))
 				if uerr, ok := err.(*url.Error); ok {
 					err = uerr.Err
 				}