Backend.ai

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- This release is replaced with v1.0.1 due to many bugs.
CHANGES
- Rename the package to "Backend.AI" and the import path to `ai.backend.agent`
- Rewrite interaction with the manager
- Read configuration from etcd shared with the manager
- Add FIFO-style scheduling of overlapped execution requests
- Implement I/O and network statistic collection using sysfs

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FIX
- Fix and improve version reference mechanisms.
- Fix missing import error vanished during hostfix cherrypick

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IMPROVEMENTS
- It now applies the same UID to the spawned containers if they have the "uid-match"
feature label flag. (backported from develop)

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FIX
- Add missing "sorna-common" dependency and update other requirements.

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FIX
- Fix the wrong version range of an optional depedency package "datadog"

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IMPROVEMENTS
- Improve packaging so that setup.py has the source list of dependencies
whereas requirements.txt has additional/local versions from exotic
sources.
- Support exception/event logging with Sentry and runtime statistics with Datadog.