Merge tag 'pull-for-6.2-161121-1' of https://github.com/stsquad/qemu into staging

Misc build and test fixes:

  - force NOUSER for base docker images
  - don't run TCG VM tests by default
  - remove useless meson test
  - add Centos 8 custom runner
  - split up custom-runners to individual files
  - skip cirrus checks on master/stable branches

# gpg: Signature made Tue 16 Nov 2021 05:22:09 PM CET
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]

* tag 'pull-for-6.2-161121-1' of https://github.com/stsquad/qemu

:
  gitlab: skip cirrus jobs on master and stable branches
  gitlab-ci: Split custom-runners.yml in one file per runner
  Jobs based on custom runners: add CentOS Stream 8
  meson: remove useless libdl test
  tests/vm: don't build using TCG by default
  tests/vm: sort the special variable list
  tests/docker: force NOUSER=1 for base images

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