Uninstalls a given list of disabled modules.
as of Drupal 8.0. Use Drupal::moduleHandler()->uninstall($module_list, $uninstall_dependents = TRUE).
function module_uninstall($module_list = array(), $uninstall_dependents = TRUE) {
return Drupal::moduleHandler()
->uninstall($module_list, $uninstall_dependents);
}