CRM-10189 - Drupal Rules Integration - Contact created/updated/deleted event not firing

This fix was never applied to the Drupal6 stream so applying it now.

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* CRM-10189: Contact created/updated/deleted event not firing
  https://issues.civicrm.org/jira/browse/CRM-10189
Merge pull request #188 from skellystarman/CRM-10189-6.x-master

CRM-10189 - Drupal Rules Integration - Contact created/updated/deleted...