Backend.ai

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- Fix permission handling for container-agent intercommunication socket which
has prevented unexpected crashes of containers in certain conditions.
- Mount hand-made tmp dirs only when custom tmpfs is enabled.
- Update Jupyter style resources.

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- Fix handling of empty resource allocation when rescanning running containers.
(The bug may happen when the CUDA plugin is installed in the nodes that do not have
CUDA-capable GPUs.)

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- Minor updates to match with the manager changes.
- Update dependency: aioredis

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- NEW: Add (official) support for TensorBoard with the default logdir:
/home/work/logs
- CHANGE: Use the same "dev" krunner-env image tags for all pre-release and
development versions to prevent hassles of tag renaming during development.
- CHANGE: Now the idle timeout is applied per kernel to support
lablup/backend.ai-manager92 implementation.
- CHANGE: Rename "--redis-auth" option to "--redis-password" and its
environment variable equivalent as well.
- Fix and update accelerator plugin support by adding an in-container socket
which provides host-only-available information to in-container programs.
- Apply a customized look-and-feel to Jupyter notebooks in Python-based containers.

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- NEW: A side-by-side watcher daemon (107)
- It provides a separate channel for watching and controlling the agent
even when the agent become unavailable (e.g., deadlock or internal crash).
- It works best with a SystemD integration.
- WARNING: Currently "reload" (agent restart without terminating running
containers) has problems with PID tracking. Finding solutions for this...
- NEW: Support Redis/etcd authentication (lablup/backend.ai-manager138)
- NOTE: Currently etcd authentication is *not* usable in productions due to
a missing implementation of automatic refreshing auth tokens in the upstream
etcd3 library.
- NEW: Agent-level (system-wide) live statistics (101)
- Fix detection of up-to-date local Docker image (105)
- Fix ordering of prompt outputs and user input events in the query mode (106)

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- NEW: Add pagination support to the GraphQL API (132)
- CHANGE: Unspecified (or zero'ed) per-image resource limits are now treated as
*unlimited*.
- Implement RW/RO permissions when mounting shared vfolders (82)
- Fix various bugs including CLI commands for image aliases, the session restart
API, skipping SSL certificate verification in CLI commands, fixture population with
enum values and already-inserted rows, and session termination hang-up in specific
environments where locally bound sockets are not accessible via the node's
network-local IP address.