CRM-14137 alter report metadata in api result to be keyed as 'metadata' per discussions

----------------------------------------
* CRM-14137: Report_template.getrows api - allow retrieval of metadata at the top level
  http://issues.civicrm.org/jira/browse/CRM-14137
Fix e-notice on Case/Demographics report so it does not need to be excluded from test
Merge pull request #2461 from eileenmcnaughton/CRM-14137-2

CRM-14137 - further PR on returning report_template metadata in getrows api action