zero byte file is getting created instead of directory when accessed via s3 API

[Rahul Singh]

Following are the steps I follow to see the issue:
- Create a folder 'test' inside a container using swift API. Used a header 'Content-Type: application/directory' to create a folder.
- If I access the same container using s3 API, there is not folder 'test', instead I see a zero byte file with same name 'test'.

It might happen that s3 API expects an empty object to have a metadata 'Content-Type: application/x-directory' to be a directory/folder. I am using 'stein' release of swift. if any more information is required, let me know. Thanks in advance.