'Retrieves string from the configuration transforming the result.
Arguments:
- option: option name whose value is to be retrieved;
- xforms: iterable that returns transform functions
to be applied to the value of the option,
both retrieved and default one;
- default: default value for string if no such option
exists.'

def getconf_xform(self, option, xforms, default=CustomConfigDefault):

    value = self.getconf(option, default)
    return self.getconfig().apply_xforms(value, xforms)
