Providing a policy.d test for Octavia is a bit more complicated as the
obvious policy is just to prevent listing of load balancers;
unfortunately it doesn't work in the upstream, as the code doesn't check
the policy in octavia. However, "showing" an load balancer does involve
a policy check and so the test is more complicated than 'normal' policy
tests in that a resource is created, then the policy override is checked
and then the resource is deleted.
