set mesh local prefix

def setMLPrefix(self, sMeshLocalPrefix):
        """set mesh local prefix"""
        print '%s call setMLPrefix' % self.port
        try:
            cmd = 'dataset meshlocalprefix %s' % sMeshLocalPrefix
            self.hasActiveDatasetToCommit = True
            return self.__sendCommand(cmd)[0] == 'Done'
        except Exception, e:
            ModuleHelper.WriteIntoDebugLogger("setMLPrefix() Error: " + str(e))