vm: Fix IP address of DispVM after restore (#247)

IP was set by udev script only on VM start, not restore

appvm/qubes_core_appvm

@@ -50,6 +50,13 @@ start()
 			usleep 10
 		done
 		echo Back to life.
+		# Fix IP address (replace template IP with DispVM one)
+		IP=$(/usr/bin/xenstore-read qubes_ip 2>/dev/null)
+		if [ "$IP" ]; then
+			ip addr flush dev eth0
+			ip addr add dev eth0 $IP/32
+			ip route add dev eth0
+		fi
 	fi
 
 	MEM_CHANGE_THRESHOLD_KB=30000