Add missing aethercast setting for apparmor in Ubuntu Touch 16.04 (xenial)

fix_aethercast_apparmor.sh

#!/bin/bash -x

if (( $EUID != 0 )); then
    FULLFILENAME=$(readlink -e $0)
    sudo -i "$FULLFILENAME"
    exit
fi

if !(grep -q "aethercast" /etc/apparmor.d/sbin.dhclient); then
    echo "Updating /etc/apparmor.d/sbin.dhclient"
    mount -o rw,remount /
    cp /etc/apparmor.d/sbin.dhclient /etc/apparmor.d/sbin.dhclient.bak
    ADDLINES='  # aethercast\n  \/{,var\/}run\/aethercast\/dhclient*.leases lrw,\n\n'
    sed -e "s/  # if there is a custom script, let it run unconfined/${ADDLINES}  # if there is a custom script, let it run unconfined/" < /etc/apparmor.d/sbin.dhclient.bak > /etc/apparmor.d/sbin.dhclient
    mount -o ro,remount /
fi