'Changes the value of a tor configuration option. Our value can be any of
the following...
* a string to set a single value
* a list of strings to set a series of values (for instance the ExitPolicy)
* None to either set the value to 0/NULL
:param str param: configuration option to be set
:param str,list value: value to set the parameter to
:raises:
* :class:`stem.ControllerError` if the call fails
* :class:`stem.InvalidArguments` if configuration options
requested was invalid
* :class:`stem.InvalidRequest` if the configuration setting is
impossible or if there\'s a syntax error in the configuration values'

def set_conf(self, param, value):

    self.set_options({param: value}, False)
