code: function doListDatasetClients(filter, cb) {
    debug('doListDatasetClients');
    var col = mongoClient.collection(DATASETCLIENTS_COLLECTION);
    col.find(filter).toArray(function(err, datasetClients) {
      if (err) {
        debugError('Failed to list datasetClients due to error %s', err);
      }
      return cb(err, datasetClients);
    });
  }
docs: The dataset client record object
  @typedef {Object} storage~DatasetClientRecord
  @property {String} uid - the uid of the record
  @property {String} hash - the hash value of the data field of the record
  @property {Object} data - the actual data of the record
   
  List all the dataset clients docs.
  @param {Object} filter
  @param {Function} cb