Fix acceptance

* Fix acceptance info API to return user_id
* Adjust the url sent in the role / license acceptance email
  ```
  Change the url to <webview.url>/contents/<id>@draft/role-acceptance

  MANUAL-UPGRADE: Add "webview.url" to the ini file (e.g. development.ini)
  ```
@reedstrm This is the link used in the email. It will be hitting webview first. Or maybe I'm misunderstanding what's happening.

If I understand correctly, webview catches all ``@draft`` as editable, which is why I thought we needed to remove this part of the url. ( @amberwebb @dak can you confirm? )