In this release cycle, a few services are enabling the
enforce scope and new defaults by default. Example Nova:
- https://review.opendev.org/c/openstack/nova/+/866218)
Until the new defaults enalbing by default is not released we
should keep testing the old defaults in existing jobs and we can
add new jobs testing new defautls. To do that we can provide the
way in devstack to keep scope/new defaults disable by default which
can be enabled by setting enforce_scope variable to true.
Once any service release the new defaults enabled by default then
we can switch the bhavior, enable the scope/new defaults by default
and a single job can disbale them to keep testing the old defaults
until service does not remove those.
Change-Id: I5c2ec3e1667172a75e06458f16cf3d57947b2c53