Update openstack documentation with Calico

Linked to the issue https://github.com/kubernetes-incubator/kubespray/issues/1359

docs/openstack.md

@@ -37,12 +37,8 @@ Then you can use the instance ids to find the connected [neutron](https://wiki.o
 
 Given the port ids on the left, you can set the `allowed_address_pairs` in neutron:
 
-    # allow kube_service_addresses network
-    neutron port-update 5662a4e0-e646-47f0-bf88-d80fbd2d99ef --allowed_address_pairs list=true type=dict ip_address=10.233.0.0/18
-    neutron port-update e5ae2045-a1e1-4e99-9aac-4353889449a7 --allowed_address_pairs list=true type=dict ip_address=10.233.0.0/18
-
-    # allow kube_pods_subnet network
-    neutron port-update 5662a4e0-e646-47f0-bf88-d80fbd2d99ef --allowed_address_pairs list=true type=dict ip_address=10.233.64.0/18
-    neutron port-update e5ae2045-a1e1-4e99-9aac-4353889449a7 --allowed_address_pairs list=true type=dict ip_address=10.233.64.0/18
+    # allow kube_service_addresses and kube_pods_subnet network
+    neutron port-update 5662a4e0-e646-47f0-bf88-d80fbd2d99ef --allowed_address_pairs list=true type=dict ip_address=10.233.0.0/18 ip_address=10.233.64.0/18
+    neutron port-update e5ae2045-a1e1-4e99-9aac-4353889449a7 --allowed_address_pairs list=true type=dict ip_address=10.233.0.0/18 ip_address=10.233.64.0/18
 
 Now you can finally run the playbook.