Placement API policies have been modified to drop the system
scope (every policy is now project scoped) and also modified
the defaults. Most of the policies are default to admin_or_service
role except reshape which is service role only and project resource
usage which is allowed for project reader and admin-or-service role.
Implement: policy-defaults-improvement
Change-Id: I806753e5b36a18be191a839256aaa84b511778f4
636d65e3ef