Merge tag 'pull-10.0-testing-and-gdstub-updates-100225-1' of https://gitlab.com/stsqu...

Merge tag 'pull-10.0-testing-and-gdstub-updates-100225-1' of https://gitlab.com/stsquad/qemu into staging

testing and gdbstub updates:

  - add a check-rust test to docker builds
  - re-factor the qtest logic to be cleaner
  - fix tests to not clock_step when no timers enabled
  - roll-up log prefix into qtest_send
  - cleaner error reporting when qtest_clock_set fails
  - revert old deadlock fix now tests are updated
  - only run full set of migration tests under HW acceleration
  - support late attachment to user-mode gdbstubs

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* tag 'pull-10.0-testing-and-gdstub-updates-100225-1' of https://gitlab.com/stsquad/qemu:
  tests/tcg: Add late gdbstub attach test
  docs/user: Document the %d placeholder and suspend=n QEMU_GDB features
  gdbstub: Allow late attachment
  osdep: Introduce qemu_kill_thread()
  user: Introduce host_interrupt_signal
  user: Introduce user/signal.h
  gdbstub: Try unlinking the unix socket before binding
  gdbstub: Allow the %d placeholder in the socket path
  tests/qtest/migration: Pick smoke tests
  tests/qtest/migration: Add --full option
  Revert "util/timer: avoid deadlock when shutting down"
  tests/qtest: tighten up the checks on clock_step
  tests/qtest: rename qtest_send_prefix and roll-up into qtest_send
  tests/qtest: simplify qtest_process_inbuf
  tests/qtest: don't step clock at start of npcm7xx periodic IRQ test
  tests/qtest: don't attempt to clock_step while waiting for virtio ISR
  tests/docker: replicate the check-rust-tools-nightly CI job

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>