We need to be able to list all buckets in DB without knowing project ID. This method will be used to list buckets for metainfo loop implementation based on metabase. Change-Id: Iac75af0eee4f31e80a15577575a8249cbca787b2
* value attribution merge fix and more test cases
* adds "partner_id" column to user, project, api_key & bucket_metainfo tables