Native write-to-pcap mode?

[cmeister2]

I've just added a script which generates a one-sided pcap file from corpora responses.

Would it be useful if the fuzzers could generate a pcap file for all traffic on the sockets? FUZZ_VERBOSE gets us some of the way there but it's in text rather than pcap.

(I'm wondering if this is something that libcurl could generate on its own, but I don't think CURLOPT_DEBUGFUNCTION is entirely appropriate for this purpose. Maybe there's an option I'm missing...)