wu-ftpd: debconf-is-not-a-registry ./usr/sbin/addftpuser

# lintian gets confused because postinst is a perl script 
wu-ftpd: postrm-contains-additional-updaterc.d-calls /etc/init.d/wu-ftpd
wu-ftpd: script-in-etc-init.d-not-registered-via-update-rc.d /etc/init.d/wu-ftpd
