Modify the base class for functional tests so that base scope and user
information can be loaded from the client, which in turn was
instantiated from cloud config.
The base scope and user info will be used in tests, e.g when creating a
user, we will use the domain from the base class to put the user in.
The base project will be used as the default user's project.
Change-Id: Ib01da8d8bfc11a06bf0d79fac2089ca5b9506670
620bf3db5f