byte-quotas cannot pass PUT object which has been existence

[renminmin]

With the account byte-quotas, the request PUT object which have been created return 413 ERROR Upload exceeds quota.
Actually, the quotas is enough for the object which will be over-write the old version object.

$ swift stat
                        Account: AUTH_d25297aa17cd4d68afd868f2a224c129
                     Containers: 5
                        Objects: 8
                          Bytes: 8602227
Containers in policy "policy-0": 5
   Objects in policy "policy-0": 8
     Bytes in policy "policy-0": 8602227
               Meta Quota-Bytes: 8602229
    X-Account-Project-Domain-Id: default
                    X-Timestamp: 1450318014.19374
                     X-Trans-Id: tx4f691d4b29e9428d8c3d3-00567d10cc
                   Content-Type: text/plain; charset=utf-8
                  Accept-Ranges: bytes

The object swift.bak have been created and content length is 35603
$ swift stat test1 swift.bak

       Account: AUTH_d25297aa17cd4d68afd868f2a224c129
     Container: test1
        Object: swift.bak
  Content Type: application/x-trash
Content Length: 35603
 Last Modified: Fri, 25 Dec 2015 05:31:41 GMT
          ETag: c7dbdc613e3c4a32f82d96846b43042c
    Meta Mtime: 1451021445.038680
 Accept-Ranges: bytes
   X-Timestamp: 1451021500.19120
    X-Trans-Id: tx04004ab8eb8c456e9d0c1-00567d1196

upload the object swift.bak with the same size.

$ swift upload test1 swift.bak
Object PUT failed: http://192.168.106.128:7007/v1/AUTH_d25297aa17cd4d68afd868f2a224c129/test1/swift.bak 413 Request Entity Too Large Upload exceeds quota.

[OpenStack Infra (hudson-openstack)]

Change abandoned by renminmin (<email address hidden>) on branch: master
Review: https://review.opendev.org/263227