t5551: handle v2 protocol when checking curl trace

After cloning an http repository, we check the curl trace to make sure the expected requests were made. But since the expected trace was never updated to handle v2, it is only run when you ask the test suite to run in v0 mode (which hardly anybody does). Let's update it to handle both protocols. This isn't too hard since v2 just sends an extra header and an extra request. So we can just annotate those extra lines and strip them out for v0 (and drop the annotations for v2). I didn't bother handling v1 here, as it's not really of practical interest (it would drop the extra v2 request, but still have the "git-protocol" lines). There's a similar tweak needed at the end. Since we check the "accept-encoding" value loosely, we grep for it rather than finding it in the verbatim trace. This grep insists that there are exactly 2 matches, but of course in v2 with the extra request there are 3. We could tweak the number, but it's simpler still to just check that we saw at least one match. The verbatim check already confirmed how many instances of the header we have; we're really just checking here that "gzip" is in the value (it's possible, of course, that the headers could have different values, but that seems like an unlikely bug). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>