Backend.ai

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FIXES
- Make sure all errorneous responses to contain RFC 7807-style JSON-formatted
error messages using aiohttp middleware.

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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"

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CHANGES
- Now it uses [`aiodocker`](https://github.com/achimnol/aiodocker)
instead of [`docker-py`](https://github.com/docker/docker-py) to
prevent timeouts with many concurrent requests.

NOTE: You need to run `pip install -r requirements.txt` to install the
non-pip (GitHub) version of aiodocker correctly, before running
`pip install sorna-agent`.

FIXES
- Fix corner-case exceptions in statistics/heartbeats.