Steps to reproduce
==============================
1. Create the external network and subnet
2. Create internal networks N1 and N2 with each network having one subnet each.
3. create security group and create ports with this security group.
4. Boot four vms on two computes.
5. Create a router and associate the subnets to router
6. Update the router with external network(associate external gateway with router, SNAT=false, single ExtIP)
7. Create L3vpn and associate external network to VPN
8. Create a floating IP on a neutron port hosted on VSwitch1
9. Access the floating IP from the external network(via DC Gateway)

Pass Criteria:
==================================
Topology created and Open Flow channel is established between VSwitches.
External network and subnets are created successfully
Internal networks are created successfully
Router created successfully and the association of internal network should succeed
L3Vpn gets created association to external network is successful.
Floating ip is
Floating IP is created and updated in the flow table

Check for fixed ip in the flow<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<Fails here

Logs attached

==================================