message: [dns64] correctly update bind9 configuration
diff: @@ -89,7 +89,6 @@ dns64_install()
  dns64_uninstall()
  {
  with NAT64 && with DNS64 || return 0
  - [ ! -f /.dockerenv ] || return 0
  dns64_stop
  sudo sed -i '/^\tlisten-on-v6/d' $BIND_CONF_OPTIONS
  @@ -102,7 +101,7 @@ dns64_uninstall()
  sudo sed -i '/^nameserver '$DNS64_NAMESERVER_ADDR'/d' $RESOLV_CONF_HEAD || true
  - dns64_update_resolvconf
  + [ -f /.dockerenv ] || dns64_update_resolvconf
  if have systemctl; then
  sudo systemctl stop bind9 || true
  