qemu: Fix type of a completed job

qemu: Fix type of a completed job

Libvirt 3.7.0 and earlier libvirt reported a migration job as completed
immediately after QEMU finished sending migration data at which point
migration was not really complete yet. Commit v3.7.0-29-g3f2d6d829e
fixed this, but caused a regression in reporting statistics for
completed jobs which started reporting the job as still running. This
happened because the completed job statistics including the job status
are copied from the running job before we finally mark it as completed.

Let's make sure QEMU_DOMAIN_JOB_STATUS_COMPLETED is always set in the
completed job info even when the job has not finished yet.

https://bugzilla.redhat.com/show_bug.cgi?id=1523036

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>