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

Block layer patches:

- file-posix: Fix max transfer length for non-SCSI-passthrough
- iotests: Fix 082 reference output

# gpg: Signature made Fri 12 Jul 2019 14:49:14 BST
# gpg:                using RSA key 7F09B272C88F2FD6
# 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:
  file-posix: Use max transfer length/segment count only for SCSI passthrough
  iotests: Update 082 expected output

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