[SECURITY] Fedora 29 Update: proftpd-1.3.6-21.fc29

ProFTPD is an enhanced FTP server with a focus toward simplicity, security, and ease of configuration. It features a very Apache-like configuration syntax, and a highly customizable server infrastructure, including support for multiple ‘virtual’ FTP servers, anonymous FTP, and permission-based directo ry visibility. This package defaults to the standalone behavior of ProFTPD, but all the needed scripts to have it run by systemd instead are included.