private NodesSpecification createNodesSpecificationForLogserver() {
        DeployState deployState = context.getDeployState();
        if (     deployState.getProperties().useDedicatedNodeForLogserver()
                && deployState.isHostedTenantApplication(context.getApplicationType()))
            return NodesSpecification.dedicated(1, context);
        else
            return NodesSpecification.nonDedicated(1, context);
    }
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