code: def get_default_config(self):
          
          default_config = super(SNMPInterfaceCollector,
                                 self).get_default_config()
          default_config['path'] = 'interface'
          default_config['byte_unit'] = ['bit', 'byte']
          return default_config
docs: Override SNMPCollector.get_default_config method to provide
          default_config for the SNMPInterfaceCollector