Debug output changed to a valid JSON

[edsonarios]

Issue link #1779
Before

[{'displayName': 'user', 'email': 'user@', 'iamId': '123', 'id': 123, 'username': 'SL123', 'createDate': '2014-02-04T10:33:57-06:00', 'description': 'SL123', 'id': 123, 'modifyDate': '', 'name': 'SL123', 'newUserDefaultFlag': 0, 'systemFlag': 1}],...

After

[{"displayName": "user", "email": "user@", "iamId": "123", "id": 123, "username": "SL123", "createDate": "2014-02-04T10:33:57-06:00", "description": "SL123", "id": 123, "modifyDate": "", "name": "SL123", "newUserDefaultFlag": 0, "systemFlag": 1}],...