private static boolean isExistingContainer(Container container, VespaModel currentModel) {
        return currentModel.getService(container.getConfigId()).isPresent();
    }
Returns a restart action for each container that has turned on {@link QrConfig#restartOnDeploy()}.

@author bjorncs
config-model/src/main/java/com/yahoo/vespa/model/application/validation/change/ContainerRestartValidator.java