apply slice.exposed_ports to network.ports when nat-net instantiated
diff --git a/xos/synchronizers/openstack/model_policies/model_policy_Slice.py b/xos/synchronizers/openstack/model_policies/model_policy_Slice.py
index bb95b54..088d583 100644
--- a/xos/synchronizers/openstack/model_policies/model_policy_Slice.py
+++ b/xos/synchronizers/openstack/model_policies/model_policy_Slice.py
@@ -64,6 +64,8 @@
                         template = NetworkTemplate.objects.get(name='Public shared IPv4'),
                     owner = slice
                     )
+            if slice.exposed_ports:
+                nat_net.ports = slice.exposed_ports
             nat_net.save()
             public_nets.append(nat_net)
             print "MODEL POLICY: slice", slice, "made nat-net"