Merge remote-tracking branch 'remotes/cleber-gitlab/tags/python-next-pull-request...

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

Python and Acceptance Tests

- New SMMUv3 and Intel IOMMU tests
- Respect "cpu" tags and reduce boiler plate code
- Improved logging of qemu execution output
- Other misc improvements

# gpg: Signature made Tue 13 Jul 2021 22:11:36 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-gitlab/tags/python-next-pull-request: (23 commits)
  tests/acceptance/cpu_queries.py: use the proper logging channels
  tests/acceptance/linux_ssh_mips_malta.py: drop identical setUp
  Acceptance tests: do not try to reuse packages from the system
  python: Configure tox to skip missing interpreters
  tests/acceptance: Handle cpu tag on x86_cpu_model_versions tests
  tests/acceptance: Add set_vm_arg() to the Test class
  python/qemu: Add args property to the QEMUMachine class
  tests/acceptance: Tagging tests with "cpu:VALUE"
  tests/acceptance: Let the framework handle "cpu:VALUE" tagged tests
  tests/acceptance: Fix mismatch on cpu tagged tests
  tests/acceptance: Automatic set -cpu to the test vm
  tests/acceptance: Tag NetBSD tests as 'os:netbsd'
  avocado_qemu: Add Intel iommu tests
  avocado_qemu: Add SMMUv3 tests
  Acceptance Tests: Add default kernel params and pxeboot url to the KNOWN_DISTROS collection
  avocado_qemu: Fix KNOWN_DISTROS map into the LinuxDistro class
  tests/acceptance: Ignore binary data sent on serial console
  Acceptance Tests: support choosing specific distro and version
  Acceptance Tests: move definition of distro checksums to the framework
  Acceptance Tests: rename attribute holding the distro image checksum
  ...

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