Implement secure RBAC for share replica locations
Implement secure RBAC for share replica locations

This commit updates the policies for share replica locations 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.

Change-Id: I2964f82844df47006e79c90d32f43174203f2aa6

openstack/manila,openstack/manila