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Merge pull request #33720 from feiskyer/hyper

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Proposal: Add HyperContainer runtime

This PR adds a proposal for integrating [HyperContainer](http://hypercontainer.io) runtime via CRI.

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<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>
If you are using a released version of Kubernetes, you should
refer to the docs that go with that version.
Documentation for other releases can be found at
[releases.k8s.io](http://releases.k8s.io).
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Kubelet HyperContainer Container Runtime
=======================================
Authors: Pengfei Ni (@feiskyer), Harry Zhang (@resouer)
## Abstract
This proposal aims to support [HyperContainer](http://hypercontainer.io) container
runtime in Kubelet.
## Motivation
HyperContainer is a Hypervisor-agnostic Container Engine that allows you to run Docker images using
hypervisors (KVM, Xen, etc.). By running containers within separate VM instances, it offers a
hardware-enforced isolation, which is required in multi-tenant environments.
## Goals
1. Complete pod/container/image lifecycle management with HyperContainer.
2. Setup network by network plugins.
3. 100% Pass node e2e tests.
4. Easy to deploy for both local dev/test and production clusters.
## Design
The HyperContainer runtime will make use of the kubelet Container Runtime Interface. [Fakti](https://github.com/kubernetes/frakti) implements the CRI interface and exposes
a local endpoint to Kubelet. Fakti communicates with [hyperd](https://github.com/hyperhq/hyperd)
with its gRPC API to manage the lifecycle of sandboxes, containers and images.
![frakti](https://cloud.githubusercontent.com/assets/676637/18940978/6e3e5384-863f-11e6-9132-b638d862fd09.png)
## Limitations
Since pods are running directly inside hypervisor, host network is not supported in HyperContainer
runtime.
## Development
The HyperContainer runtime is maintained by <https://github.com/kubernetes/frakti>.
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