Glare patch api move operation doesn't work as expected

[Sruthy S]

1. Given a NS package in created state:
    "ns_packages": [
        {
            "status": "drafted",
            "description": "NS pkg update",
            "name": "nspkg_update_props_311115258",
            "tags": [
                "tag1",
                "tag2"
            ],
            "created_at": "2018-01-18T06:30:56Z",
            "activated_at": null,
            "updated_at": "2018-01-18T06:30:57Z",
            "visibility": "private",
            "package": null,
            "version": "1.0.1",
            "owner": "CloudBandNetworkDirector",
            "id": "db1f00f1-17e4-4dda-9992-8b74b87d01a2",
            "contents": {},
            "metadata": {
                "meta": "meta1"
            }
        }
    ]

2. I send a PATCH request below:
[{
 "operation": "move",
 "srcAttr": "tags/0",
 "targetAttr": "metadata/meta2"
}]

Response:
        {
            "status": "drafted",
            "description": "NS pkg update",
            "name": "nspkg_update_props_311115258",
            "tags": [
                "tag1",
                "tag2"
            ],
            "created_at": "2018-01-18T06:30:56Z",
            "activated_at": null,
            "updated_at": "2018-01-18T06:50:11Z",
            "visibility": "private",
            "package": null,
            "version": "1.0.1",
            "owner": "CloudBandNetworkDirector",
            "id": "db1f00f1-17e4-4dda-9992-8b74b87d01a2",
            "contents": {},
            "metadata": {
                "meta2": "tag1",
                "meta": "meta1"
            }
        }

It's observed that tag1 is copied and not moved as mentioned in http://jsonpatch.com/. We already have a copy operation which copies data from one attribute to other.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/561544

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/561544
Committed: https://git.openstack.org/cgit/openstack/glare/commit/?id=57a589fccdfa6ab3cec69dd44b35ee8917b63bd7
Submitter: Zuul
Branch: master

commit 57a589fccdfa6ab3cec69dd44b35ee8917b63bd7
Author: Kushal Agrawal <email address hidden>
Date: Mon Apr 16 13:51:28 2018 +0530

    Move Operation bug fix in update API

    updating the value of source location in move operation
    as part of artifact update.

    Change-Id: Ic6912fa9c714762e38ba01793a7a8da1a70a12ba
    Closes-bug: #1743971