This reverts commit 7ff150ced70d0db565378683909e22dfac5383e1.
Sadly we can't use the X-Auth-Token approach due to implementational details (the token is valid only for an hour). So we need to switch back to using swiftclient.
This way there's less secrets that need to be shared and less new code to introduce. We also modified the test tooling to be able to check for authentication tokens in the queries.
