Merge tag 'python-pull-request' of https://gitlab.com/jsnow/qemu into staging

Merge tag 'python-pull-request' of https://gitlab.com/jsnow/qemu into staging

Python testing fixes for 6.2

A few more fixes to help eliminate race conditions from
device-crash-test, along with a fix that allows the SCM_RIGHTS
functionality to work on hosts that only have Python 3.6.

If this is too much this late in the RC process, I'd advocate for at
least patch 7/7 by itself.

# gpg: Signature made Tue 23 Nov 2021 03:37:17 AM CET
# gpg:                using RSA key F9B7ABDBBCACDF95BE76CBD07DEF8106AAFC390E
# gpg: Good signature from "John Snow (John Huston) <jsnow@redhat.com>" [full]

* tag 'python-pull-request' of https://gitlab.com/jsnow/qemu:
  python/aqmp: fix send_fd_scm for python 3.6.x
  scripts/device-crash-test: Use a QMP timeout
  python/machine: handle "fast" QEMU terminations
  python/machine: move more variable initializations to _pre_launch
  python/machine: add instance disambiguator to default nickname
  python/machine: remove _remove_monitor_sockfile property
  python/machine: add @sock_dir property

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