def getconfig(self, nodenum, conftype, defaultvalues):
        if nodenum in self.configs:
            # return configured values
            conflist = self.configs[nodenum]
            for (t, v) in conflist:
                if (conftype is None) or (t == conftype):
                    return (t, v)
        # return default values provided (may be None)
        return (conftype, defaultvalues)
get configuration values for a node; if the values don't exist in
dataset/ETHPy150Open coreemu/core/daemon/core/conf.py/ConfigurableManager.getconfig