vsftpd: fix install warning
vsftpd: fix install warning

WARNING: QA Issue: vsftpd: Files/directories were installed but not shipped
  /run
  /run/vsftpd
  /run/vsftpd/empty

Signed-off-by: Roy Li <a4059d05326ba905aeb95e84c67e39dbdf6837e9@windriver.com>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

WindRiver-OpenSourceLabs/meta-networking