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

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

Python queue, 2017-09-15

# gpg: Signature made Sat 16 Sep 2017 00:14:01 BST
# gpg:                using RSA key 0x2807936F984DC5A6
# 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:
  qemu.py: include debug information on launch error
  qemu.py: improve message on negative exit code
  qemu.py: use os.path.null instead of /dev/null
  qemu.py: avoid writing to stdout/stderr
  qemu.py: fix is_running() return before first launch()
  qtest.py: Few pylint/style fixes
  qmp.py: Avoid overriding a builtin object
  qmp.py: Avoid "has_key" usage
  qmp.py: Use object-based class for QEMUMonitorProtocol
  qmp.py: Couple of pylint/style fixes
  qemu.py: Use custom exceptions rather than Exception
  qemu.py: Simplify QMP key-conversion
  qemu.py: Use iteritems rather than keys()
  qemu|qtest: Avoid dangerous arguments
  qemu.py: Pylint/style fixes

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