This patch makes the bifrost-keystone-client-config role a bit more
generic to allow creating more that a single cloud configuration
setting.
The role is changed to accept a dict with possibly many clouds configurations,
and the template for clouds.yaml is changed accordingly.
This new functionality is used right away to add the keystone admin user
to the created clouds.yaml file to make the installed keystone usable
for admin-level operations (listing and editig users, projects, roles
and role assignments) - the name of the 'cloud' created is
'bifrost-admin'.
Change-Id: Icb274de989966645cd0f3874f8dff9d9f37d871b
e09bec2c83