Merge tag 'pull-testing-docs-270423-1' of https://gitlab.com/stsquad/qemu into staging

Testing and documentation updates:

  - bump avocado to 101.0
  - use snapshots for tuxrun baseline tests
  - add sbda-ref test to avocado
  - avoid spurious re-configure in gitlab
  - better description of blockdev options
  - drop FreeBSD 12 from Cirrus CI
  - fix up the ast2[56]00 tests to be more stable
  - improve coverage of ppc64 tests in tuxrun baselines
  - limit plugin tests to just the generic multiarch binaries

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* tag 'pull-testing-docs-270423-1' of https://gitlab.com/stsquad/qemu

:
  docs/style: call out the use of GUARD macros
  docs/devel: mention the spacing requirement for QOM
  docs/devel: make a statement about includes
  docs/system: remove excessive punctuation from guest-loader docs
  qemu-options.hx: Update descriptions of memory options for NUMA node
  tests/tcg: limit the scope of the plugin tests
  tests/avocado/tuxrun_baselines.py: improve code coverage for ppc64
  avocado_qemu/__init__.py: factor out the qemu-img finding
  MAINTAINERS: Cover tests/avocado/machine_aspeed.py
  tests/avocado/machine_aspeed: Fix the broken ast2[56]00_evb_sdk tests
  tests/avocado: Make ssh_command_output_contains() globally available
  .gitlab-ci.d/cirrus: Drop the CI job for compiling with FreeBSD 12
  qemu-options: finesse the recommendations around -blockdev
  scripts/device-crash-test: Add a parameter to run with TCG only
  gitlab-ci: Avoid to re-run "configure" in the device-crash-test jobs
  tests/avocado: Add set of boot tests on SBSA-ref
  tests/avocado: use the new snapshots for testing
  tests/requirements.txt: bump up avocado-framework version to 101.0

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