[hold] Runtimeclass API

[tallclair]

Adds (but doesn't implement) the RuntimeClass API proposed in https://github.com/kubernetes/community/blob/master/keps/sig-node/0014-runtime-class.md

For kubernetes/enhancements#585

Special notes for your reviewer:

Release note:

RuntimeClass is a new API resource for defining different classes of runtimes that may be used to run containers in the cluster. Pods can select a RunitmeClass to use via the RuntimeClassName field. This feature is in alpha, and the RuntimeClass feature gate must be enabled in order to use it.

/sig node
/kind api-change
/priority important-soon
/milestone v1.12

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tallclair]

/hold
This feature still needs sig-architecture review.

/cc @dchen1107 @derekwaynecarr

[k8s-ci-robot]

@tallclair: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kubernetes-integration	7d33abe	link	/test pull-kubernetes-integration
pull-kubernetes-e2e-gce	7d33abe	link	/test pull-kubernetes-e2e-gce
pull-kubernetes-verify	7d33abe	link	/test pull-kubernetes-verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[CaoShuFeng]

Items is a list of RuntimeClass?

[vikaschoudhary16]

/cc

[k8s-ci-robot]

@tallclair: PR needs rebase.

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[tallclair]

Closing to separate pod changes & new API.