smb: do some cleanups

smb: do some cleanups

Modify the following places:

  - Add documentation references
  - ATTR_REPARSE -> ATTR_REPARSE_POINT: consistent with MS-SMB 2.2.1.2.1
  - Remove unused File Attribute flags from server, if the server uses
    them in the future, we can move the client-side definitions to common
  - Remove unused SMB1_CLIENT_GUID_SIZE from server

Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>