Add "connect to job" functionality, use that for CondorSpawner#200

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unibonn:connect_to_job

Commits on Jul 11, 2022

BatchSpawnerBase: Add background_tasks, connect_to_job feature.
olifre
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batchspawner/CondorSpawner: Make use of connect_to_job feature.
olifre
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BatchSpawnerBase: Extend connect_to_job for port forwarding approaches.
olifre
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batchspawner/CondorSpawner: Make use of connect_to_job rport feature.
olifre
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BatchSpawnerBase: Don't use internal API of asyncio.Tasks.
olifre
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BatchSpawnerBase: Replace {host} with self.ip in connect_to_job_cmd.
olifre
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batchspawner/CondorSpawner: Allow to disable connect_to_job_cmd.
olifre
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BatchSpawnerBase: Move connect_to_job before DB commit and debug logging.
olifre
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BatchSpawnerBase: Store ip, port in self.server after connect_to_job
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batchspawner: tests: Disable connect_to_job in testing.
olifre
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