Re: [Libguestfs] [PATCH v4 05/24] nbd: s/handle/cookie/ to match NBD spec

Externally, libnbd exposed the 64-bit opaque marker for each client NBD packet as the "cookie", because it was less confusing when contrasted with 'struct nbd_handle *' holding all libnbd state. It also avoids confusion between the nown 'handle' as a way to identify a packet and the verb 'handle' for reacting to things like signals. Upstream NBD changed their spec to favor the name "cookie" based on libnbd's recommendations[1], so we can do likewise. [1]https://github.com/NetworkBlockDevice/nbd/commit/ca4392eb2b Signed-off-by: Eric Blake<eblake(a)redhat.com>