oslo.policy can not handle policy file removal. As a result, if policy
overrides were defined at some point, but then removed, causes service
outage.
While we could add a handler trigger to restart the service
on policy removal, it's better to simplify the logic and always place an
empty policy.yaml even if no overrides are defined.
Change-Id: I8dd86f47ec33775b55bbe2d05fea783347825501
Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>
50e5571e7d