Open Stack

Hi:
     There is something confuse.
     Original，manage resource with project,i can limit an project's resouce.
     now ,i use dashboard,there is no project,but have a tenant

     In nova database,the user and project table is blank when i create a
user with 'nova-manage user admin test',dashboard can't  identification it
     and the tenant's resouces limit is still use quotas tables which is in
nova databases.

what i want to know is why use tenant instead of project?  is there some
thing is superfluous, such as nova's user and project
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