- Deprecate service_username and service_password so that we can use
more simple parameter names like username.
- Deprecate user_domain_id because we use user_domain_name generally.
- Change the defaut value of project_domain_name because Default
instead of default is now used generally for default domain name.
Change-Id: I69565d6888d778a109b0e39108d660a871a8202d