Re: [Libguestfs] [PATCH v4 21/24] nbd/client: Request extended headers during negotiation

All the pieces are in place for a client to finally request extended headers. Note that we must not request extended headers when qemu-nbd is used to connect to the kernel module (as nbd.ko does not expect them, but expects us to do the negotiation in userspace before handing the socket over to the kernel), but there is no harm in all other clients requesting them. Extended headers are not essential to the information collected during 'qemu-nbd --list', but probing for it gives us one more piece of information in that output. Update the iotests affected by the new line of output. Signed-off-by: Eric Blake<eblake(a)redhat.com>