Backend-ai-manager

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- Fix synchronization issues when restarting kernels

- Fix missing database column errors when restarting streaming sessions

- Fix a missing null check when registering new agents or updating existing ones

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- Now we use a new kernel image naming and tagging scheme.
Check out the comments in the sample image alias configuration
at the repository root (image-aliases.sample.yml)

- Now the manager fully controls the resource allocation in agents
when creating a new kernel session.

- Updated aiohttp to v2.3.2

- Various bug fixes and improvements

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- This release is replaced with v1.0.1 due to many bugs.

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**NOTICE**

- The package name will be changed to "backend.ai-manager" and the import
paths will become ``ai.backend.manager.something``.

**CHANGES**

- Let it accept "BackendAI" API requests as well for future compatibility.
(39)

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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.