Merge tag 'pull-maintainer-9.1-rc0-230724-1' of https://gitlab.com/stsquad/qemu into staging

Maintainer updates for testing, gdbstub, semihosting, plugins

  - bump python in *BSD images via libvirt-ci
  - remove old unused Leon3 Avocado test
  - re-factor gdb command extension
  - add stoptrigger plugin to contrib
  - ensure plugin mem callbacks properly sized
  - reduce check-tcg noise of inline plugin test
  - fix register dumping in execlog plugin
  - restrict semihosting to TCG builds
  - fix regex in MTE test

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* tag 'pull-maintainer-9.1-rc0-230724-1' of https://gitlab.com/stsquad/qemu:
  tests/tcg/aarch64: Fix test-mte.py
  semihosting: Restrict to TCG
  target/xtensa: Restrict semihosting to TCG
  target/riscv: Restrict semihosting to TCG
  target/mips: Restrict semihosting to TCG
  target/m68k: Restrict semihosting to TCG
  target/mips: Add semihosting stub
  target/m68k: Add semihosting stub
  semihosting: Include missing 'gdbstub/syscalls.h' header
  plugins/execlog.c: correct dump of registers values
  tests/plugins: use qemu_plugin_outs for inline stats
  plugins: fix mem callback array size
  plugins/stoptrigger: TCG plugin to stop execution under conditions
  gdbstub: Re-factor gdb command extensions
  tests/avocado: Remove non-working sparc leon3 test
  testing: bump to latest libvirt-ci

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