Merge remote-tracking branch 'remotes/ehabkost/tags/python-next-pull-request' into staging

Python queue, 2018-02-05

# gpg: Signature made Mon 05 Feb 2018 23:07:57 GMT
# gpg:                using RSA key 2807936F984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/python-next-pull-request: (21 commits)
  docker: change Fedora images to run with python3
  travis: improve python version test coverage
  ui: update keycodemapdb to get py3 fixes
  input: add missing JIS keys to virtio input
  qemu.py: don't launch again before shutdown()
  qemu.py: cleanup redundant calls in launch()
  qemu.py: use poll() instead of 'returncode'
  qemu.py: always cleanup on shutdown()
  qemu.py: refactor launch()
  qemu.py: better control of created files
  qemu.py: remove unused import
  configure: allow use of python 3
  scripts: ensure signrom treats data as bytes
  qapi: force a UTF-8 locale for running Python
  qapi: ensure stable sort ordering when checking QAPI entities
  qapi: remove '-q' arg to diff when comparing QAPI output
  qapi: Adapt to moved location of 'maketrans' function in py3
  qapi: adapt to moved location of StringIO module in py3
  qapi: Use OrderedDict from standard library if available
  qapi: use items()/values() intead of iteritems()/itervalues()
  ...

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