[PATCH v3 0/8] qemu-nbd: Restore "qemu-nbd -v --fork" output

[Denis V. Lunev]

This series contains the fix to the regression introduced with 5c56dd27a2
plus documentation update.

Changes from v2:
- fixed error message of dup2 (patch #1)
- removed options copy as suggested by Eric
- moved all other options used in nbd_client_thread() to struct NbdClientOpts
  for consistency
- added documentation update to document -v behavior
- small formatting fix (please drop if this is extra)

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Eric Blake <eblake@redhat.com>
CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>