Merge tag 'pull-nbd-2025-03-05' of https://repo.or.cz/qemu/ericb into staging

NBD patches for 2025-03-05

- Several iotest fixes
- Refactor QMP for NbdServerOptions for less repetition
- Avoid a hang in 'qemu-nbd --fork' when simple trace backend is enabled

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* tag 'pull-nbd-2025-03-05' of https://repo.or.cz/qemu/ericb:
  nbd: Defer trace init until after daemonization
  qapi: merge common parts of NbdServerOptions and nbd-server-start data
  iotests: Stop NBD server in test 162 before starting the next one
  iotest: Unbreak 302 with python 3.13

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>