rgw: RGW Quota has a bug when restart radosgw client

[baixueyu]

You can reproduce this issue as below:
first,
enable user quota, set max objects 5, set max_size_kb 100M
set rgw_bucket_quota_ttl = 0, rgw_user_quota_bucket_sync_interval = 0
second,
upload 5 small objects, then upload the sixth object, the size quota while exceed
third,
change rgw_bucket_quota_ttl = 3000, rgw_user_quota_bucket_sync_interval = 1500
restart radosgw client,
delete all the objects while we just upload,
fouth,
now, we upload object will exceed the size quota.

Signed-off-by: Xueyu Bai baixueyu@inspur.com

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