getListData
Call gotListData with the data returned from underlying behavior's implementation of
[can-connect/connection.gotListData].
    getListData(listSet)
  
  Extends the underlying behavior's getListData to call gotListData with the returned
response data. The result of the call to gotListData will be used as the new response data.
Parameters
- listSet 
{Object}:an object that represents the set of data to be loaded
 
Returns
 {Promise<Object>}: 
Promise resolving the raw response data, possibly modified by gotListData.