Merge tag 'pull-10.1-rc1-maintainer-260725-1' of https://gitlab.com/stsquad/qemu...

documentation and test cleanups

  - improve clarity of user-mode docs
  - remove reference to TAP tarball
  - add new hypervisor test for aarch64 EL2
  - reduce combinatorial explosion of plugin tests
  - make docker-all-test-cross more friendly to non-x86 hosts
  - expose unittests to sysv.args for embedded help

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* tag 'pull-10.1-rc1-maintainer-260725-1' of https://gitlab.com/stsquad/qemu:
  tests/functional: expose sys.argv to unittest.main
  tests/docker: handle host-arch selection for all-test-cross
  tests/docker: add --arch-only to qemu deps for all-test-cross
  tests/tcg: reduce the number of plugin tests combinations
  configure: expose PYTHON to test/tcg/config-host.mak
  tests/tcg: don't include multiarch tests if not supported
  tests/tcg: remove ADDITIONAL_PLUGINS_TESTS
  tests/tcg: skip libsyscall.so on softmmu tests
  tests/functional: add hypervisor test for aarch64
  docs/user: expand section on threading
  docs/user: slightly reword section on system calls
  docs/user: clean up headings
  docs/system: reword the TAP notes to remove tarball ref
  docs/user: clarify user-mode expects the same OS

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