User Story: As a Satellite user, I want to know how I must configure a host so that I can use Global Registration properly and securely to register the host

Host needs to be configured a certain way before it can be registered by using Global Registration and that isn't properly documented at the present time.

We have a Configure a host for registration module, but we don't use it in the Managing Hosts guide currently, which we should do.

Also, we should provide a prerequisite so that the user can call the curl as secured instead of explaining how to use an insecured call and what bad could happen.