use child_process.exec() instead of spawn() in ip6tables.iptables()
use child_process.exec() instead of spawn() in ip6tables.iptables()

MelvinTo/firewalla,MelvinTo/firewalla,MelvinTo/firewalla,firewalla/firewalla,firewalla/firewalla,firewalla/firewalla,MelvinTo/firewalla,firewalla/firewalla,MelvinTo/firewalla,firewalla/firewalla