Backend.ai

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* Upgrade to use aiohttp v3 series.
* Improve handling of base directories outside the current working directory
when uploading files for the batch mode execution.
* Display exit code if available in the batch mode execution.

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* Hotfix: Add missing "ai.backend.client.cli.admin" module in the package.

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* Apply authentication to websocket requests as well.
* Fix the client-side validation of client token length.

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* Relicensed to MIT License to motivate integration with commercial/proprietary
software products.
* Lots of CLI improvements!

- Add "terminate" command.

- Add more "run" command options. Now it does NOT terminate the session after
execution by default, and you can force it using "--rm" option.

- Add "admin keypairs" command and its subcommands for managing keypairs.

- Add "admin agents" command to list agent instances.

- "ps" and "admin session" commands now correctly show the client-given session ID
token instead of the master kernel ID of the session.

- Add "logs" command.
* Fix a continuation bug of the "run" command when using the batch-mode, which
has caused a mismatch of run ID management of the agent and the internal task
queue of the kernel runner, resulting an indefinite hang up with two legitimate
subsequent requesting of batch-mode executions.

As being a reference implementation of the execution loop, all API users are
advised to review and fix their client-side codes.
* Now the client sets a custom User-Agent header value as follows:
"Backend.AI Client for Python X.X.X" where X.X.X is the version.

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* Add mount ("-m"), environment variable ("-e") arguments to CLI "run" command
which can be specified multiple times.
This deprecates "-b" and "-e" abbreviations for "--build" and "--exec".
* Fix garbled tabular outputs of CLI commands in Python versions less than 3.6
due to non-preserved dictionary ordering.

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- Automatically assign the run ID if set None when starting a run.
- Pass environment variables in the start-config to the kernels via
`/home/work/.config/environ.txt` file mounted inside kernels.
- Include the list of kernel images available to the agent when sending
heartbeats. (51)
- Remove simplejson from dependencies in favor of the standard library.
The stdlib has been updated to support all required features and use
an internal C-based module for performance.