atftpd launches twice due to INETD=true and file transfers do not work

[atftpd-bug]

after doing a the default install of atftpd, if you do `ss -tuapen` you see there are two horizontal lines of text regarding port :69 being open. if you try to do a file transfer, even within the localhost/loopback, it fails.

this is not the case with x86 debian after install atftpd (tested debian 9.12).

to fix the issue on raspbian, you must change `USE_INETD=true` to `USE_INETD=false` in /etc/default/atftpd and /etc/init.d/atftpd (or perhaps only in one of those files), then reboot. then file transfers will work.

please add a raspbian patch which fixes this.

[atftpd-bug (atftpd-bug)]

note that atftpd is the recommended tftpd server by ddwrt and openwrt for router recovery (and it works well for this), so it is a relatively important package

[atftpd-bug (atftpd-bug)]

error occurs with latest raspbian, by the way ('10.3' in /etc/debian_version)