pcap: change snaplen in header
pcap: change snaplen in header

the field doesn't really have a meaning, but some tools don't like
too large values

libmoon/libmoon,scholzd/libmoon,libmoon/libmoon,emmericp/libmoon,emmericp/libmoon,scholzd/libmoon,scholzd/libmoon,emmericp/libmoon,libmoon/libmoon