[winswitch] Disable TCP on systemd socket activation

[Michael Cronenworth]

On 10/23/20 4:05 AM, Antoine Martin via shifter-users wrote:
> Right.
> Based on your request, I have just added a simple way to make this work:
> https://www.xpra.org/trac/ticket/2914
>
> You can grab the latest centos8 beta builds which have this change
> already included.

I tested this today using the 4.0.5-10.r27999.el8_2 packages, but I do not see any 
change in behavior.

I tried to set the new environment variable in three places:
- /etc/sysconfig/xpra (XPRA_SD_SOCKET_TYPE=ssl)
- /etc/xpra/conf.d/05_features.conf (env = XPRA_SD_SOCKET_TYPE=ssl)
- /lib/systemd/system/xpra.service (modified ExecStart line to include --env=...)

After reloading SystemD and restarting the Xpra service and socket, connections to 
port 14500 are still handled using plain TCP all the way past authentication to the 
session. I'm using a web browser (Firefox) and the HTML5 client if that makes any 
difference.

Any I doing something wrong or did I mislead you in my enhancement request?

Thanks,
Michael