Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- mirror: Fix deadlock
- nbd/server: Fix race in draining the export
- qemu-img snapshot: Fix formatting with large values
- Fix blockdev-snapshot-sync error reporting for no medium
- iotests fixes

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* tag 'for-upstream' of https://repo.or.cz/qemu/kevin:
  iotests: adapt to output change for recently introduced 'detached header' field
  tests/qemu-iotests: Restrict tests using "--blockdev file" to the file protocol
  tests/qemu-iotests: Fix some tests that use --image-opts for other protocols
  tests/qemu-iotests: Restrict tests that use --image-opts to the 'file' protocol
  tests/qemu-iotests: Restrict test 156 to the 'file' protocol
  tests/qemu-iotests: Restrict test 134 and 158 to the 'file' protocol
  tests/qemu-iotests: Restrict test 130 to the 'file' protocol
  tests/qemu-iotests: Restrict test 114 to the 'file' protocol
  tests/qemu-iotests: Restrict test 066 to the 'file' protocol
  tests/qemu-iotests: Fix test 033 for running with non-file protocols
  qemu-img: Fix Column Width and Improve Formatting in snapshot list
  blockdev: Fix blockdev-snapshot-sync error reporting for no medium
  iotests: Add test for reset/AioContext switches with NBD exports
  nbd/server: Fix race in draining the export
  mirror: Don't call job_pause_point() under graph lock

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>