host-route via allow-address-pair doesn't work without disabling RPF

[eon]

In a scenario where there is a VRRP VIP between 2 VMs and a host-route via the VIP the ingress flow gets dropped.

The problem is that the interface-route-table that propagate the src prefix in the ingress vrouter table is not created because the VIP is not a real port.

                      P1 network

       VM_1 .......................... VM_2
        | ............................. |
       VMI_1 ...... <---- VIP ---> ... VMI_2
       (aap on vip) .................. (aap on vip)

              host-route via VIP to P1
                           |
                      P2 network

One workaround is to disable RPF P2 side but this can't be done using openstack APIs.

The other solution is to create interface-route-table on VMI_1 and VMI_2
to announce the P1 prefix since they have AAP on the VIP that has a host-route to P1

Observed on 2.21.x

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/21271
Submitter: Jean-Philippe Braun (<email address hidden>)

[eon (eon-5)]

Adding multiple interface-route-table for the same prefix doesn't work because only one route will be announced to vrouter agents

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/22761
Submitter: Jean-Philippe Braun (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/22761
Committed: http://github.org/Juniper/contrail-neutron-plugin/commit/e177c13ab2420a790d8471f9414b55d270eec8bc
Submitter: Zuul
Branch: master

commit e177c13ab2420a790d8471f9414b55d270eec8bc
Author: Jean-Philippe Braun <email address hidden>
Date: Tue Aug 2 10:57:16 2016 +0200

Use route-table object for host-routes

Since route-table can be now used to specify routes with
next-hop IPs, we can remove the usage of interface-route-table
for host-routes.

This makes the code a lot simpler and the use cases with host-route
via allow-address-pair IP will work.

Closes-Bug: #1593758
Change-Id: If423e6647f46fc8101d2baf7868c65f2542b6f84