docs: def _make_wildcard_attr_map():
      '''
      Create a dictionary that maps an attribute name
      in OpenflowMatch with a non-prefix-related wildcard
      bit from the above OpenflowWildcard enumeration.
      '''
      _xmap = {}
      for wc in OpenflowWildcard:
          if not wc.name.endswith('All') and \
              not wc.name.endswith('Mask'):
              translated = ''
              for ch in wc.name:
                  if ch.isupper():
                      translated += '_' 
                      translated += ch.lower()
                  else:
                      translated += ch
              _xmap[translated] = wc
      return _xmap