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In preparation for implementaing basic default roles[1] within Barbican moving RuleDefault to DocumentedRuleDefault in policy files. Route to policy work being updated and tracked in wiki[2]. [1] - https://github.com/openstack/keystone-specs/blob/master/specs/keystone/rocky/define-default-roles.rst [2] - https://wiki.openstack.org/wiki/Barbican/Policy Co-Authored-By: Juan Antonio Osorio Robles <jaosorior@redhat.com> Change-Id: I73dd0cf8a89dc24a44b6bc2151d95df632932ccc