Glance has added support for project persona of secure RBAC as
an experimental feature where 'enforce_secure_rbac' has been introduced.
Adding support of 'enforce_secure_rbac' parameter here.
Partially Implements: blueprint secure-rbac
Change-Id: I1db7fa2694bc9a448a47e435cfd95264504086c6
(cherry picked from commit fdb2c555fd)