message: nydusify: change default fs version to 6
  Nydus-image has changed its default fs version,
  let nydusify adapt it.
diff: @@ -335,8 +335,8 @@ func main() {
  &cli.StringFlag{
  Name: "fs-version",
  Required: false,
  - Value: "5",
  - DefaultText: "V5 format",
  + Value: "6",
  + DefaultText: "V6 nydus image format",
  Usage: "Nydus image format version number, possible values: 5, 6",
  EnvVars: []string{"FS_VERSION"},
  },
  @@ -355,7 +355,7 @@ func main() {
  &cli.StringFlag{
  Name: "prefetch-dir",
  Value: "",
  - Usage: "Specify an ansolute path within the image for prefetch",
  + Usage: "Specify an absolute path within the image for prefetch",
  EnvVars: []string{"PREFETCH_DIR"},
  },
  &cli.BoolFlag{
  @@ -774,8 +774,8 @@ func main() {
  Required: false,
  Usage: "Nydus image format version number, possible values: 5, 6",
  EnvVars: []string{"FS_VERSION"},
  - Value: "5",
  - DefaultText: "V5 format",
  + Value: "6",
  + DefaultText: "V6 nydus image format",
  },
  &cli.StringFlag{
  