Description of problem:

In the guide we currently do not document creation of specific keystone admin users for each service, instead using the one "admin" account (with a few exceptions).

We should look to provide additional (optional) steps for users wishing to perform more realistic deployments and need/want to create these accounts.

Thanks to Marc Jadoul for reporting this issue.

Additional info:

I have 2 small questions related to Glance config in the "preview getting
started guide".

First, in some document on internet, a specific user is created for glance
service and configured in glance configuration files.
For instance:
admin_tenant_name = service
admin_user = glance
admin_password = glance

But the documentation seems to indicate using the admin user of
keystone.....