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

Python (acceptance tests) queue, 2019-09-19

# gpg: Signature made Thu 19 Sep 2019 17:24:04 BST
# gpg:                using RSA key 7ABB96EB8B46B94D5E0FE9BB657E8D33A5F209F3
# gpg: Good signature from "Cleber Rosa <crosa@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 7ABB 96EB 8B46 B94D 5E0F  E9BB 657E 8D33 A5F2 09F3

* remotes/cleber/tags/python-next-pull-request:
  BootLinuxSshTest: Only run the tests when explicitly requested
  tests/acceptance: Specify arch for QueryCPUModelExpansion

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