Sorna-agent

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**CHANGES**

- Separate console output formats for API v1 and v2.

- Deprecate unused matching option for execution API.

- Remove control messages in API responses.

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**NEW**

- PUSH/PULL-based kernel interaction protocol to support streaming outputs.
This enables interactive input functions and streaming outputs for long-running codes,
and also makes kernel execution more resilient to network failures.
(ZeroMQ's REQ/REP sockets break the system if any messages get dropped)

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**FIXES**

- Fix a typo that generates errors during GPU kernel initialization.

- Fix regression of '--agent-ip-override' cli option.

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- Minor internal polishing release.

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**CHANGES**

- Bump version to 0.8 to match with sorna-manager and sorna-client.

**FIXES**

- Fix events lost by HTTP connection timeouts when using `docker.events.run()` from aiodocker.
(it is due to default 5-minute timeout set by aiohttp)

- Correct task cancellation

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**CHANGES**

- Add new aliases for "git" kernel: "git-shell" and "shell"