materio-base-d7/sites/all/modules/contrib/migrate/migrate_extras/migrate_extras.module

<?php

function migrate_extras_init() {
  // Set variable to FALSE to disable rules processing.
  if (module_exists('rules') && !variable_get('migrate_extras_rules', TRUE)) {
    foreach (rules_get_event_sets() as $key => $set) {
      $GLOBALS['conf']['rules_inactive_sets'][] = $key;
    }
  }
}