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Fix crash when spawned job completes very fast

Valentin Davidrequested to merge
valentindavid/crash_in_scheduler_857 into master

Description

Job can complete before we return from Job.span() to Scheduler._spawn_job(), so that _active_jobs would not yet contain the job.

This would print a stack on the console and try to run a second time the job which can have unexpected effects.

In order to reproduce the issue, in buildstream/_scheduler/jobs/job.py, in Job.spawn, add a call to time.sleep() right before call to asyncio.get_child_watcher().

This merge request, when approved, will close: #857 (closed)

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