Implement secure RBAC for floating IP pools API
Implement secure RBAC for floating IP pools API

This commit updates the policies for floating IP pools API
to understand scope checking and account for a read-only role.

This is part of a broader series of changes across OpenStack to
provide a consistent RBAC experience and improve security.

Partially-Implements blueprint: secure-rbac-roles

Change-Id: I60dea66e2ba6f5f450e3eae3f67f721c35940e92

mahak/neutron,mahak/neutron,openstack/neutron,openstack/neutron,openstack/neutron,mahak/neutron