Merge tag 'migration-20230602-pull-request' of https://gitlab.com/juan.quintela/qemu into staging

Migration Pull request (20230602 vintage)

This PULL request get:
- All migration-test patches except last one (daniel)
- Documentation about live test cases (peter)

Please apply.

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# Primary key fingerprint: 1899 FF8E DEBF 58CC EE03  4B82 F487 EF18 5872 D723

* tag 'migration-20230602-pull-request' of https://gitlab.com/juan.quintela/qemu

:
  qtest/migration: Document live=true cases
  tests/qtest: make more migration pre-copy scenarios run non-live
  tests/qtest: distinguish src/dst migration VM stop/resume events
  tests/qtest: capture RESUME events during migration
  tests/qtest: replace wait_command() with qtest_qmp_assert_success
  tests/qtest: switch to using event callbacks for STOP event
  tests/qtest: get rid of some 'qtest_qmp' usage in migration test
  tests/qtest: get rid of 'qmp_command' helper in migration test
  tests/qtest: add support for callback to receive QMP events
  tests/qtest: add various qtest_qmp_assert_success() variants

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