Returns an object which is generated from a dict.

        Exception raises:
        KeyError -- Unknown match field is defined in dict

def from_jsondict(cls, dict_):
        """
        Returns an object which is generated from a dict.

        Exception raises:
        KeyError -- Unknown match field is defined in dict
        """
        fields = [ofproto.oxm_from_jsondict(f) for f
                  in dict_['oxm_fields']]
        o = OFPMatch(_ordered_fields=fields)
        # XXX old api compat
        # serialize and parse to fill OFPMatch.fields
        buf = bytearray()
        o.serialize(buf, 0)
        return OFPMatch.parser(six.binary_type(buf), 0)