Add additional project personas for secure RBAC

This commit formalizes some additional users to act as different project
users and updates clouds.yaml file so they're easy to use.

It creates:

  - a reader on the demo project
  - a reader on the alt_demo project
  - a member on the alt_demo project

With the adoption of secure RBAC personas, these are useful for using
OpenStack APIs as that work continues.

Change-Id: I3237a771275311377313b7d7d80ac059ac69d031
2 files changed