Change the way we specify the id ranges to force uid and gid ranges to always
be the same. Add option to specify a maximum id.
Change DNA configuration to use shared ranges so that masters and replicas can
actually share the same overall range in a safe way.
Configure replicas so that their default range is depleted. This will force
them to fetch a range portion from the master on the first install.
fixes: https://fedorahosted.org/freeipa/ticket/198
