Add limit protection tests
Add limit protection tests

This commit creates a set of sets that we can reuse across different
default roles and scopes to ensure everyone has access to limit
information. Subsequent patches will make sure we build on this
by incorporating default roles for:

 - system member test coverage
 - system admin functionality
 - domain user test coverage
 - project user test coverage

Related-Bug: 1805372
Related-Bug: 1805880

Change-Id: I085578e715939c9b472df65bb3a50c0acf62f37e

mahak/keystone,openstack/keystone,openstack/keystone,openstack/keystone,mahak/keystone,mahak/keystone