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

Pull request

# gpg: Signature made Mon 01 Nov 2021 01:29:49 PM EDT
# gpg:                using RSA key F9B7ABDBBCACDF95BE76CBD07DEF8106AAFC390E
# gpg: Good signature from "John Snow (John Huston) <jsnow@redhat.com>" [full]

* remotes/jsnow/tags/python-pull-request: (22 commits)
  python, iotests: replace qmp with aqmp
  python/aqmp: Create sync QMP wrapper for iotests
  iotests/300: avoid abnormal shutdown race condition
  iotests: Conditionally silence certain AQMP errors
  iotests: Accommodate async QMP Exception classes
  python/aqmp: Remove scary message
  python/machine: Handle QMP errors on close more meticulously
  python/machine: remove has_quit argument
  python: Add iotest linters to test suite
  iotests/linters: Add workaround for mypy bug #9852
  iotests/linters: Add entry point for linting via Python CI
  iotests: split linters.py out from 297
  iotests/297: split test into sub-cases
  iotests/297: update tool availability checks
  iotests/297: Change run_linter() to raise an exception on failure
  iotests/297: refactor run_[mypy|pylint] as generic execution shim
  iotests/297: Split run_linters apart into run_pylint and run_mypy
  iotests/297: Don't rely on distro-specific linter binaries
  iotests/297: Create main() function
  iotests/297: Add get_files() function
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>