Get ScaleIO SDS object by its name
        :param name: Name of SDS
        :return: ScaleIO SDS object
        :raise KeyError: No SDS with specified name found
        :rtype: SDS object

def get_sds_by_name(self,name):
        """
        Get ScaleIO SDS object by its name
        :param name: Name of SDS
        :return: ScaleIO SDS object
        :raise KeyError: No SDS with specified name found
        :rtype: SDS object
        """
        for sds in self.sds:
            if sds.name == name:
                return sds
        raise KeyError("SDS of that name not found")