You made things in a complicated way, there is far too much parameters you don't need in the .cfg files you show.
All you have to do is to have a basic .cfg file (with an arbitrary name, do not necessarily edit existing one) with almost nothing in it, and a command to start the server with the .cfg file as a parameter.
Debian should already have the command to start the server, then the main task for you is to fill some rather empty config file.
The main things to set up are port number, IP address, the first map to start with, hostname, and some "map rotation" to do things well.
So, we've got our /etc/init.d scripts, and we have the config file.
Here is an example of config file :
http://openarena.tuxfamily.org/wiki/projet:reseau:serveur1 (same kind that you've seen on the wiki).
I separated map rotation from main configuration.
You've got a list of maps which come with the game here : (
DO NOT LINK) h t t p s : / / openarena . wikia . com/wiki/Maps
You'll see there are DM maps, and CTF maps as well, so you don't need to download anything
That's about all, good luck