'The cloudaux iter_account_region decorator returns a list of tuples.
Each tuple contains two members.  1) The result. 2) The exception map.
This method combines that list of tuples into a single result list and a single exception map.'

def _flatten_iter_response(self, response):

    items = list()
    exception_map = dict()
    for result in response:
        items.extend(result[0])
        exception_map.update(result[1])
    return (items, exception_map)
