ec2api chokes on lbaasv2 port

[Jon Proulx]

aws ec2 describe-instances

fails with:

An error occurred (NotFound) when calling the DescribeInstances operation: Instance 6f6557de-545d-4242-a7a4-eb18b3eba88f could not be found.

There is not nor has there ever been an instance with that UUID, however looking at debug logs I can see this failure follows

REQ: curl -g -i -X GET https://<NEUTRON_ENDPOINT>/v2.0/ports?tenant_id=<UUID>

and in the response body there is an LBAASv2 loadbalancer with that UUID:

    {
      "status": "ACTIVE",
      "created_at": "2017-11-02T00:44:17",
      "description": null,
      "allowed_address_pairs": [],
      "admin_state_up": true,
      "network_id": "259e350d-9ea5-4dc5-8a1c-4ab7deef9eec",
      "tenant_id": "bfd50153a2e9476f93e33e30e922cd06",
      "extra_dhcp_opts": [],
      "updated_at": "2018-10-19T21:20:13",
      "name": "loadbalancer-6f6557de-545d-4242-a7a4-eb18b3eba88f",
      "device_owner": "neutron:LOADBALANCERV2",
      "mac_address": "fa:16:3e:26:08:c9",
      "port_security_enabled": true,
      "binding:vnic_type": "normal",
      "fixed_ips": [
        {
          "subnet_id": "2019039a-089f-408c-b080-201a0c5cbe6f",
          "ip_address": "10.42.0.144"
        }
      ],
      "id": "719c6ad3-5352-44ab-8414-c0e790ab52ce",
      "security_groups": [
        "2d2a123c-dd52-48a4-99fa-98a5011988f6"
      ],
      "device_id": "6f6557de-545d-4242-a7a4-eb18b3eba88f"
    },