Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

Pull request

Let's get the image fuzzer Python 3 changes merged in QEMU 4.2.

# gpg: Signature made Tue 05 Nov 2019 15:43:16 GMT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/block-pull-request:
  image-fuzzer: Use OSerror.strerror instead of tuple subscript
  image-fuzzer: Use errors parameter of subprocess.Popen()
  image-fuzzer: Run using python3
  image-fuzzer: Encode file name and file format to bytes
  image-fuzzer: Use bytes constant for field values
  image-fuzzer: Return bytes objects on string fuzzing functions
  image-fuzzer: Use %r for all fiels at Field.__repr__()
  image-fuzzer: Use io.StringIO
  image-fuzzer: Explicitly use integer division operator
  image-fuzzer: Write bytes instead of string to image file
  image-fuzzer: Open image files in binary mode

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