Convert mod_cluster excluded context into an xs:list of host:context

    // TODO: Convert into an xs:list of host:context
    static final SimpleAttributeDefinition EXCLUDED_CONTEXTS = SimpleAttributeDefinitionBuilder.create(CommonAttributes.EXCLUDED_CONTEXTS, ModelType.STRING, true)
            .setAllowExpression(true)
            .setDefaultValue(new ModelNode("ROOT,invoker,jbossws,juddi,console"))
            .setRestartAllServices()
            .build();