Resets all system_list() caches.
function system_list_reset() {
drupal_static_reset('system_list');
drupal_static_reset('system_rebuild_module_data');
drupal_static_reset('list_themes');
cache_clear_all('bootstrap_modules', 'cache_bootstrap');
cache_clear_all('system_list', 'cache_bootstrap');
// Clean up the bootstrap file scan cache.
drupal_static_reset('_drupal_file_scan_cache');
cache_clear_all('_drupal_file_scan_cache', 'cache_bootstrap');
}