Use loopback address instead of localhost to fix gethostbyname error

[thunderysteak]

Darkice has issues when localhost is used in its configuration while in a docker container, resulting in "gethostbyname error". Using a loopback address instead fixes the issue.

Starting pulseaudio...
Starting pulseaudio...
Starting Icecast2...
 * Starting streaming media server icecast2
   ...done.
[2021-05-04  00:31:14] WARN CONFIG/_parse_root Warning, <hostname> not configured, using default value "localhost". This will cause problems, e.g. with YP directory listings.
[2021-05-04  00:31:14] WARN CONFIG/_parse_root Warning, <location> not configured, using default value "Earth".
[2021-05-04  00:31:14] WARN CONFIG/_parse_root Warning, <admin> contact not configured, using default value "icemaster@localhost".
Starting spotifyd...
Starting darkice...
DarkIce 1.3 live audio streamer, http://code.google.com/p/darkice/
Copyright (c) 2000-2007, Tyrell Hungary, http://tyrell.hu/
Copyright (c) 2008-2013, Akos Maroy and Rafael Diniz
This is free software, and you are welcome to redistribute it
under the terms of The GNU General Public License version 3 or
any later version.

Using config file: /home/user/darkice.cfg
Using ALSA DSP input device: pulse
Could not set POSIX real-time scheduling, this may cause recording skips.
Try to run darkice as the super-user.
DarkIce: TcpSocket.cpp:226: gethostbyname error [0]

You can prevent DarkIce to attempt to look for a hostname by using a loopback address instead.

Tested by copying the cfg from the docker container, modifying the value and then copying the file back into the container