Merge tag 'pull-block-2021-12-22' of https://gitlab.com/hreitz/qemu into staging

Block patches:
- Added support to the iotests for running tests in several parallel
  jobs (using the new -j parameter)

# gpg: Signature made Wed 22 Dec 2021 08:38:55 AM PST
# gpg:                using RSA key CB62D7A0EE3829E45F004D34A1FA40D098019CDF
# gpg:                issuer "hreitz@redhat.com"
# gpg: Good signature from "Hanna Reitz <hreitz@redhat.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: CB62 D7A0 EE38 29E4 5F00  4D34 A1FA 40D0 9801 9CDF

* tag 'pull-block-2021-12-22' of https://gitlab.com/hreitz/qemu:
  iotests: check: multiprocessing support
  iotests/testrunner.py: move updating last_elapsed to run_tests
  iotests/testrunner.py: add doc string for run_test()

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