stop OpenThreadWpan

        Returns:
            True: successfully stop OpenThreadWpan
            False: failed to stop OpenThreadWpan

def __stopOpenThreadWpan(self):
        """stop OpenThreadWpan

        Returns:
            True: successfully stop OpenThreadWpan
            False: failed to stop OpenThreadWpan
        """
        print 'call stopOpenThreadWpan'
        try:
            if self.__sendCommand(WPANCTL_CMD + 'leave')[0] != 'Fail' and self.__sendCommand(WPANCTL_CMD + 'dataset erase')[0] != 'Fail':
                return True
            else:
                return False
        except Exception, e:
            ModuleHelper.WriteIntoDebugLogger('stopOpenThreadWpan() Error: ' + str(e))