Backend.ai

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* FIX: TensorBoard startup error due to favoring IPv6 address
* CHANGE: Internally restructured the codebase so that we can add different agent implementations
easily in the future. Kubernetes support is coming soon! (125)
* Accept a wider range of `ai.backend.base-distro` image label values which do not
include explicit version numbers.

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* CHANGE: Reduce the default websocket ping interval of Jupyter notebooks to 10 seconds
to prevent intermittent connection losts in specific browser environments. (131)

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* NEW: Add support for watcher information reports (107)
* Improve versioning of krunner volumes not to interfere with running containers
when upgraded (120)
* Add support for getting core dumps inside container as configuration options (114)
* Fix missing instance ID for configuration scope maps (127)
* Pin the pyzmq version to 18.1.0 (lablup/backend.ai47)

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* FIX: Disable trash bins in the Jupyter browsers (lablup/backend.ai45)
* FIX: Revert "net.netfilter.nf_conntrack_tcp_timeout_established" in the recommended kernel parameters
to the Linux kernel's default (5 days = 432000 seconds). (lablup/backend.ai46)
* CHANGE: The CPU overcommit factor (previously fixed to 2) is now adjustable by the environment variable
"BACKEND_CPU_OVERCOMMIT_FACTOR" and the dfault is now 1.
* NEW: Add an option to change the underlying event loop implementation.

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* Include attached_devices in the kernel creation response (lablup/backend.ai-manager154)
- Compute plugins now should implement `get_attched_devices()` method.
* Improved support for separation of agent host and kernel (container) hosts
(lablup/backend.ai37)
* Add support for scaling-groups as configured by including them in heartbeats
(backend.ai-manager167)
* Implement reserved resource slots for CPU and memory (110, 112)

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* CHANGE: vfolder (storage) names may have a single dot prefix (e.g., ".local").
* FIX: inversion of docker-registry.ssl-verify option
* Updated kernel's get_info REST API to work with latest compute session models. (160)
* Extend support for group/shared vfolders and invitation-related APIs. (149, 166)