api v2 update_recordset works improperly when updating 'records'

[stanzgy]

See examples below.
Here is a type A recordsets "www.example.net." with records 10.0.0.1 and 10.0.0.2. I want to update records to 10.0.0.3 but got 10.0.0.2 and 10.0.0.3.

$ curl -g -X GET -H "X-Auth-Token: 59abb39c9b114196acc60c31b03b6c86" http://10.180.64.22:9001/v2/zones/bc49118c-405d-4497-a567-76ba1b3cacd9/recordsets/e702d7c1-c437-4f34-88a3-237d942a53fc

{
    "recordset": {
        "created_at": "2015-01-19T18:10:12.000000",
        "description": null,
        "id": "e702d7c1-c437-4f34-88a3-237d942a53fc",
        "links": {
            "self": "http://10.180.64.22:9001/v2/zones/bc49118c-405d-4497-a567-76ba1b3cacd9/recordsets/e702d7c1-c437-4f34-88a3-237d942a53fc"
        },
        "name": "www.example.net.",
        "records": [
            "10.0.0.1",
            "10.0.0.2"
        ],
        "ttl": null,
        "type": "A",
        "updated_at": null,
        "version": 1,
        "zone_id": "bc49118c-405d-4497-a567-76ba1b3cacd9"
    }
}

$ curl -g -X PUT -H "X-Auth-Token: 59abb39c9b114196acc60c31b03b6c86" http://10.180.64.22:9001/v2/zones/bc49118c-405d-4497-a567-76ba1b3cacd9/recordsets/e702d7c1-c437-4f34-88a3-237d942a53fc -H "Content-Type: application/json" -d '{"recordset" : {"records" : ["10.0.0.3"]}}'

{
    "recordset": {
        "created_at": "2015-01-19T18:10:12.000000",
        "description": null,
        "id": "e702d7c1-c437-4f34-88a3-237d942a53fc",
        "links": {
            "self": "http://10.180.64.22:9001/v2/zones/bc49118c-405d-4497-a567-76ba1b3cacd9/recordsets/e702d7c1-c437-4f34-88a3-237d942a53fc"
        },
        "name": "www.example.net.",
        "records": [
            "10.0.0.2",
            "10.0.0.3"
        ],
        "ttl": null,
        "type": "A",
        "updated_at": "2015-01-19T18:19:29.000000",
        "version": 2,
        "zone_id": "bc49118c-405d-4497-a567-76ba1b3cacd9"
    }
}

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/148328

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/148328
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=39322736e2e6938b01d34bf5634d7227e2f780db
Submitter: Jenkins
Branch: master

commit 39322736e2e6938b01d34bf5634d7227e2f780db
Author: stanzgy <email address hidden>
Date: Tue Jan 20 02:29:22 2015 +0800

    Fix v2 api update_recordset

    Fix v2 api update_recordset when updating a recordset's records.

    Change-Id: I91a91b075787dfc6df4e6a590a0e92ecc942ba45
    Closes-Bug: 1412539