message: nydusd: recover --shared-dir for fuse backend again
  The same reason as commit ("nydusd: recover option
  shared-dir with feature fusedev").
diff: @@ -206,6 +206,14 @@ fn append_fs_options(app: App<'static, 'static>) -> App<'static, 'static> {
  .requires("config")
  .conflicts_with("shared-dir"),
  )
  + .arg(
  + Arg::with_name("shared-dir")
  + .long("shared-dir")
  + .short("s")
  + .help("Directory shared by host and guest for passthroughfs, which also enables pathroughfs mode")
  + .takes_value(true)
  + .conflicts_with("bootstrap"),
  + )
  .arg(
  Arg::with_name("prefetch-files")
  .long("prefetch-files")
  @@ -294,14 +302,6 @@ fn append_virtiofs_options(app: App<'static, 'static>) -> App<'static, 'static>
  .required(false)
  .takes_value(false),
  )
  - .arg(
  - Arg::with_name("shared-dir")
  - .long("shared-dir")
  - .short("s")
  - .help("Directory shared by host and guest for passthroughfs, which also enables pathroughfs mode")
  - .takes_value(true)
  - .conflicts_with("bootstrap"),
  - )
  .arg(
  Arg::with_name("sock")
  .long("sock")
  