old_contents: {'graph_def': '{"requests": [{"q": "system.load.1"}]}',
   'metric_query': 'system.load.1',
   'snapshot_url': 'https://s3.amazonaws.com/dd-snapshots-prod/org_1499/2013-07-19/2459d291fc021c84f66aac3a87251b6c92b589da.png'}
  
new_contents: {'graph_def': '{"requests": [{"q": "system.load.1{*}"}]}',
   'metric_query': 'system.load.1{*}',
   'snapshot_url': 'https://s3.amazonaws.com/dd-snapshots-prod/org_1499/2013-07-19/2459d291fc021c84f66aac3a87251b6c92b589da.png'}
  
subject: add scope to python graph snapshot response