Comment 7 for bug 1860913

I've just closed out the openstack/nova change as this isn't fixable on the n-cpu side at the moment without an idempotent connection_info refresh API.

We can however fix this in openstack/cinder by forcing the NFS c-vol driver to update the saved connection_info during the snapshot, allowing n-cpu's call to attachment_show to update the stored connection_info within the BDM.