'Read length bytes from name\'s stderr log starting at offset
@param string name        the name of the process (or \'group:name\')
@param int offset         offset to start reading from.
@param int length         number of bytes to read from the log.
@return string result     Bytes of log'

def readProcessStderrLog(self, name, offset, length):

    self._update('readProcessStderrLog')
    return self._readProcessLog(name, offset, length, 'stderr')
