Merge tag 'pull-for-7.1-fixes-240822-3' of https://github.com/stsquad/qemu into staging

Testing and doc updates:

  - move default timeout to QemuBaseTests
  - optimise migration tests to run faster
  - removed duplicate migration test
  - add some clarifying language to block options in manual

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* tag 'pull-for-7.1-fixes-240822-3' of https://github.com/stsquad/qemu:
  qemu-options: try and clarify preferred block semantics
  tests/qtest/migration-test: Remove duplicated test_postcopy from the test plan
  tests/migration/i386: Speed up the i386 migration test (when using TCG)
  tests/migration/aarch64: Speed up the aarch64 migration test
  tests/qtest/migration-test: Only wait for serial output where migration succeeds
  tests/avocado: push default timeout to QemuBaseTest

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