private void assignSlobroks(DeployState deployState, NodesSpecification nodesSpecification, Admin admin) {
        if (nodesSpecification.isDedicated()) {
            createSlobroks(deployState,
                           admin,
                           allocateHosts(admin.hostSystem(), "slobroks", nodesSpecification));
        }
        else { // These will be removed later, if an admin cluster (for cluster controllers) is assigned
            createSlobroks(deployState,
                           admin,
                           pickContainerHostsForSlobrok(nodesSpecification.minResources().nodes(), 2));
        }
    }
Builds the admin model from a version 4 XML tag, or as a default when an admin 3 tag or no admin tag is used.

@author bratseth
config-model/src/main/java/com/yahoo/vespa/model/builder/xml/dom/DomAdminV4Builder.java