Ovirt devel - Apr 2008 - [Patch] refactor permissions to reflect new roles/permission levels

This refactors the permissions model to support the latest 
permissions/roles design. The prior code handled privileges 
independently -- so an administrator would need to be granted each 
privilege separately.

The new model grants roles to users, currently "Super Admin", 
"Administrator", "User", and "Monitor". Each role
then has several
associated privileges (Super Admin gets all of them, Monitor only gets 
to view objects, etc.)

So the user permissions code (where users are granted access) works on 
the Roles -- but the permissions checks are by privilege.

Currently the role-privilege mapping is maintained in the Permission 
class code, rather than in the DB. If necessary, this could later be 
moved into the database (if, for example, we wanted to make it 
configurable, etc.)


Scott
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