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, 2018-10-03

* Remove fixed serial device errors from device-crash-test
* Remove unnecessary Python 2.6 compatibility code

# gpg: Signature made Thu 04 Oct 2018 03:17:34 BST
# 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:
  scripts/device-crash-test: Remove entries for serial devices
  Revert "tests: migration/guestperf Python 2.6 argparse compatibility"
  Revert "docker.py: Python 2.6 argparse compatibility"
  device-crash-test: No need for sys.path hack

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