[ s3 api ] The CreationDate of listing bucket always return '2009-02-03T16:45:09.000Z'

[Seongsoo Cho]

There are a hard coded value in s3api controller.

https://github.com/openstack/swift/blob/2.25.0/swift/common/middleware/s3api/controllers/service.py#L66

I figured out why this value wew set, and It has been used since the first commit of swift3.
https://opendev.org/x/swift3/commit/02374dbf195880c853c022758344764394fc9296

In container db, the create date of container is recorded in database. but there are no create date in account database. So, There are no way to get create date of container from the container listing.

Nevertheless, showing results at a fixed value is confusing to the user.