Manual cherrypick of kube-openapi changes for release-1.9

[roycaihw]

What this PR does / why we need it:
Cherry-picks kubernetes/kube-openapi#64 and kubernetes/kube-openapi#67
Fixes bugs that make apiserver panic when aggregating valid but not well formed OpenAPI spec (with empty Paths/Definitions)

Release note:

Fixes bugs that make apiserver panic when aggregating valid but not well formed OpenAPI spec

/cc @mbohlool
/sig api-machinery

[mbohlool]

/lgtm /approval

[lavalamp]

Why is this manual an not an automated CP of something already in master?

[lavalamp]

/approve

I'll assume there's a good reason for this and approve so I don't hold up the works :)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lavalamp, mbohlool, roycaihw

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/api/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/apiextensions-apiserver/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/apimachinery/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/apiserver/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/client-go/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/code-generator/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/kube-aggregator/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/metrics/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/sample-apiserver/Godeps/OWNERS [lavalamp]
• staging/src/k8s.io/sample-controller/Godeps/OWNERS [lavalamp]
• vendor/OWNERS [lavalamp]

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[roycaihw]

@lavalamp

Because it's a CP of changes in vendor directory. We don't want to bump the Godep version in this release branch to be the same as master, which would include every change in kube-openapi up-to-date. Instead we create a new branch in kube-openapi (https://github.com/kubernetes/kube-openapi/tree/release-1.9) which only include the two commits we need, and CP that Godep version.

[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue.

[lavalamp]

Thanks Haowei, that makes sense. :)

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