setup_ip: turn off sg

Apparently vif frontend has broken sg implementation; we already worked around
it in init.d script via ethtool; now do the same in setup_ip. It is relevant
when attaching firewallvm to a different netvm on the fly.

common/setup_ip

@@ -8,6 +8,7 @@ if [ x$ip != x ]; then
     /sbin/ifconfig $INTERFACE $ip netmask 255.255.255.255
     /sbin/ifconfig $INTERFACE up
     /sbin/route add default dev $INTERFACE
+    /sbin/ethtool -K $INTERFACE sg off
     echo "nameserver $gateway" > /etc/resolv.conf
     echo "nameserver $secondary_dns" >> /etc/resolv.conf
 	network=$(/usr/bin/xenstore-read qubes_netvm_network 2>/dev/null)