Revert "Default IPv6 by environment variable"

This reverts commit fb1032e116.

config.py

@@ -33,7 +33,6 @@ import const
 import socket
 import ipaddress 
 from socket import gethostbyname
-import os
 
 
 # Does anybody read this stuff? There's a PEP somewhere that says I should do this.
@@ -331,10 +330,6 @@ def build_config(_config_file):
                         'ENHANCED_OBP': config.getboolean(section, 'ENHANCED_OBP')
                     }})
                     
-                    #If IPv6 is enabled by enviornment variable...
-                    if CONFIG['SYSTEMS'][section]['IP'] == '' and 'FD_DEFAULT_IPV6' in os.environ and bool(os.environ['FD_DEFAULT_IPV6']):
-                        CONFIG['SYSTEMS'][section]['IP'] = '::'
-                    
                     try:
                         
                         if CONFIG['SYSTEMS'][section]['IP'] == '::':

docker-configs/docker-compose-ipv6.yml

@@ -23,7 +23,6 @@ services:
              ipv6_address: fd2a:70b6:9f54:29b6::10
         environment:
             - FDPROXY_IPV6=1
-            - FD_DEFAULT_IPV6=1
 
     ipv6nat:
         container_name: ipv6nat