Creates a dictionary from the parameters, which can be used to return data
    to Salt.

def _format_return_data(retcode, stdout=None, stderr=None):
    '''
    Creates a dictionary from the parameters, which can be used to return data
    to Salt.
    '''
    ret = {'retcode': retcode}
    if stdout is not None:
        ret['stdout'] = stdout
    if stderr is not None:
        ret['stderr'] = stderr
    return ret