Comment 9 for bug 1753209

https://review.openstack.org/#/c/553499/ and https://review.openstack.org/#/c/550987/ move a test which shares a network via neutron RBAC mechanism. Do we also need to clean up all shared network case like a network with shared=True attribute? Do we also need to clean up 'shared' cases for other resources (like subnet pool, qos policy and so on)?