execute_query_with_incremental_retry() method in client_context.py bug

[tkohegyi]

Hi, Trying to use execute_query_with_incremental_retry() method in client_context.py - with success, however it seems it swallows all query issues silently.

Please, when ClientRequestException occurs and the reason is Microsoft.SharePoint.Client.InvalidClientQueryException - (=E400 Client Error) then don't retry, just fail the function.

In other words pls update def _try_process_if_failed to fail/exit in case status_code is 400, and don't continue.

[torzsmokus]

I suggest to add a callback parameter (I am planning to open a pull request for this)