Remove firewall feature (#996)

https://github.com/EFForg/rayhunter/pull/888 contained an entire set of
iptables rules to ensure that no traffic leaked.

We know that many of these devices are fairly insecure, that's how we
get rayhunter installed on most of them. But if an attacker already is
able to run commands on this device, they are most likely going to be
able to run iptables -F too. We should discuss real threatmodels before
adding stuff like this, because messing with iptables also just makes
accidental bricking more likely (see the moxee disk space fiasco)

dist/scripts/S01iptables

@@ -1,24 +0,0 @@
-#!/bin/sh
-CONFIG="/data/rayhunter/config.toml"
-
-case "$1" in
-  start)
-    if grep -q '^firewall_restrict_outbound = true' "$CONFIG" 2>/dev/null; then
-        iptables -F OUTPUT
-        iptables -A OUTPUT -o lo -j ACCEPT
-        for br in bridge0 br0; do
-            [ -d "/sys/class/net/$br" ] && iptables -A OUTPUT -o "$br" -j ACCEPT
-        done
-        iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-        iptables -A OUTPUT -p udp --dport 67:68 -j ACCEPT
-        iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
-        iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT
-        iptables -A OUTPUT -j DROP
-        echo 0 > /proc/sys/net/bridge/bridge-nf-call-iptables 2>/dev/null
-    fi
-    ;;
-  stop)
-    iptables -F OUTPUT
-    iptables -P OUTPUT ACCEPT
-    ;;
-esac