protected void createBasicContainerModel() {
        Element clusterElem = DomBuilderTest.parse("<container id='default' version='1.0' />");
        createModel(root, clusterElem);
    }
Utility functions for testing the ContainerModelBuilder. Note that XML validation will
not be done when using this class

@author gjoranv
config-model/src/test/java/com/yahoo/vespa/model/container/xml/ContainerModelBuilderTestBase.java