rgw/s3: ListObjectsV2 returns correct object owners

[cbodley]

Fixes: https://tracker.ceph.com/issues/59471

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[mattbenjamin]

this looks plausible

[cbodley]

created a testbucket, enabled public read acl, and uploaded a single 'keyring' object. used awscli to send list-objects-v2 requests with two separate vstart users, and confirmed that they both correctly show 'testid' as the object owner:

(virtualenv) cbodley@fedora ~/ceph/build $ AWS_ACCESS_KEY_ID=ABCDEFGHIJKLMNOPQRST AWS_SECRET_ACCESS_KEY=abcdefghijklmnopqrstuvwxyzabcdefghijklmn aws --endpoint-url http://localhost:8000 s3api list-objects-v2 --bucket testbucket --fetch-owner
{
    "Contents": [
        {
            "Key": "keyring",
            "LastModified": "2023-04-27T14:47:53.505Z",
            "ETag": "\"898c361f90cb2a813fe0490c565d6031\"",
            "Size": 294,
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "M. Tester",
                "ID": "testid"
            }
        }
    ]
}
(virtualenv) cbodley@fedora ~/ceph/build $ AWS_ACCESS_KEY_ID=0555b35654ad1656d804 AWS_SECRET_ACCESS_KEY=h7GhxuBLTrlhVUyxSPUKUV8r/2EI4ngqJxD7iBdBYLhwluN30JaT3Q== aws --endpoint-url http://localhost:8000 s3api list-objects-v2 --bucket testbucket --fetch-owner
{
    "Contents": [
        {
            "Key": "keyring",
            "LastModified": "2023-04-27T14:47:53.505Z",
            "ETag": "\"898c361f90cb2a813fe0490c565d6031\"",
            "Size": 294,
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "M. Tester",
                "ID": "testid"
            }
        }
    ]
}

[cbodley]

passed qa after rerun https://pulpito.ceph.com/cbodley-2023-05-15_13:00:49-rgw-wip-cbodley-testing-distro-default-smithi/

[cbodley]

jenkins test make check

[cbodley]

jenkins test make check

[cbodley]

jenkins test make check