Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches:

- file-posix: Mitigate file fragmentation with extent size hints
- Tighten qemu-img rules on missing backing format
- qemu-img map: Don't limit block status request size
- Fix crash with virtio-scsi and iothreads

# gpg: Signature made Tue 14 Jul 2020 14:24:19 BST
# gpg:                using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg:                issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
  block: Avoid stale pointer dereference in blk_get_aio_context()
  qemu-img: Deprecate use of -b without -F
  block: Add support to warn on backing file change without format
  iotests: Specify explicit backing format where sensible
  qcow2: Deprecate use of qemu-img amend to change backing file
  block: Error if backing file fails during creation without -u
  qcow: Tolerate backing_fmt=
  vmdk: Add trivial backing_fmt support
  sheepdog: Add trivial backing_fmt support
  block: Finish deprecation of 'qemu-img convert -n -o'
  qemu-img: Flush stdout before before potential stderr messages
  file-posix: Mitigate file fragmentation with extent size hints
  iotests/059: Filter out disk size with more standard filter
  qemu-img map: Don't limit block status request size
  iotests: Simplify _filter_img_create() a bit

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

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