{
    "subnet_id": "a2f1f29d-571b-4533-907f-5803ab96ead1",
    "tenant_id": "6ba032e4730d42e2ad928f430f5da33e",
    "port_id": "3a44f4e5-1694-493a-a1fb-393881c673a4",
    "id": "b0294d7e-7da4-4202-9882-2ab1de9dabc0"
}

{
    "subnet_id": "a2f1f29d-571b-4533-907f-5803ab96ead1",
    "tenant_id": "6ba032e4730d42e2ad928f430f5da33e",
    "subnet_ids": [
        "a2f1f29d-571b-4533-907f-5803ab96ead1"
    ],
    "port_id": "3a44f4e5-1694-493a-a1fb-393881c673a4",
    "id": "b0294d7e-7da4-4202-9882-2ab1de9dabc0"
}

Correct resp of router interface add
Correct resp of router interface add

This patch fix the wrong resp message of router interface add in V2.

Closes-Bug: #1536444
Change-Id: I241d53cbbb55a44ad494486e2d1fe9e84807388a
