Merge tag 'pull-nbd-2025-05-29' of https://repo.or.cz/qemu/ericb into staging

NBD patches for 2025-05-29

- Nir Soffer: Allow for larger Unix socket buffers in NBD
- Eric Blake: clean up mirror-sparse iotest issues

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* tag 'pull-nbd-2025-05-29' of https://repo.or.cz/qemu/ericb:
  iotests: Filter out ZFS in several tests
  iotests: Improve mirror-sparse on ext4 and xfs
  iotests: Use disk_usage in more places
  nbd: Set unix socket send buffer on Linux
  nbd: Set unix socket send buffer on macOS
  io: Add helper for setting socket send buffer size

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