Set the firewall_style for the OPENVZ node to closed also.

Hope to have time to update the OPENVZ code so that we can
firewall the physical host. Not going to worry about guests.

install/genirack/shared-exp.ns

@@ -7,6 +7,7 @@ set ns [new Simulator]
 set vhost1 [$ns node]
 tb-set-node-os $vhost1 FEDORA15-OPENVZ-STD
 tb-set-node-sharingmode $vhost1 "shared_local"
+$vhost1 set-fw-style "closed"
 
 set vhost2 [$ns node]
 tb-set-node-os $vhost2 XEN43-64-STD