Should not advertise Powder FE ops node
On the FE nodes, ops is a jail with an unroutable 10.x.x.x address, but we are still putting it in the external view of the DNS. This can result in undeliverable email from outside (e.g., a reply to a message).
Don't know if such a configuration of the ops node is a general option we support or just a one-off Powder thing, so I am making the issue here.