Jobs patches:
 - small fix of job_create()
 - refactoring: drop BlockJob.blk field

# gpg: Signature made Wed 29 Dec 2021 11:11:25 AM PST
# gpg:                using RSA key 8B9C26CDB2FD147C880E86A1561F24C1F19F79FB
# gpg: Good signature from "Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.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: 8B9C 26CD B2FD 147C 880E  86A1 561F 24C1 F19F 79FB

* tag 'pull-jobs-2021-12-29' of https://src.openvz.org/scm/~vsementsov/qemu

:
  blockjob: drop BlockJob.blk field
  test-bdrv-drain: don't use BlockJob.blk
  block/stream: add own blk
  test-blockjob-txn: don't abuse job->blk
  blockjob: implement and use block_job_get_aio_context
  job.c: add missing notifier initialization

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