metadata matching

[YuvalAdler]

There are 2 problems with metadata flow matching:

1. conversion to network order in oxm_match.c should be:

    case OFI_OXM_OF_METADATA:{
        ofl_structs_match_put64(match, f->header, hton64(*((uint64_t*) value)));
        return 0;
    }
    case OFI_OXM_OF_METADATA_W:{
        ofl_structs_match_put64m(match, f->header,hton64(*((uint64_t*) value)),hton64(*((uint64_t*) mask)));

I think there are more Endian issues in that area (e.g. OFI_OXM_OF_IN_PHY_PORT).

2. Cannot use memset with uint64_t:

                memset(f->value,(*metadata & ~wi->metadata_mask) | (wi->metadata & wi->metadata_mask), sizeof(uint64_t));     

Should be:

                *metadata = (*metadata & ~wi->metadata_mask) | (wi->metadata & wi->metadata_mask);

[rrdenicol]

Fixed. Thank you!