Look through AdditionalProperties for references

[dims]

Running make api ends up with the following error:

----------------------------------
Orphaned Definitions:
[resource.v1alpha3.DeviceAttribute]
panic: Orphaned definitions found.

goroutine 1 [running]:
github.com/kubernetes-sigs/reference-docs/gen-apidocs/generators.PrintInfo(0x1400029fc38?)
        /Users/davanum/go/src/sigs.k8s.io/reference-docs/gen-apidocs/generators/util.go:47 +0x4d8
github.com/kubernetes-sigs/reference-docs/gen-apidocs/generators.GenerateFiles()
        /Users/davanum/go/src/sigs.k8s.io/reference-docs/gen-apidocs/generators/writer.go:56 +0x70
main.main()
        /Users/davanum/go/src/sigs.k8s.io/reference-docs/gen-apidocs/main.go:28 +0x64
exit status 2
make: *** [api] Error 1

If you look at the definition: https://github.com/kubernetes/kubernetes/blob/8db6fc7e3fabc00f12be17d5a1623cba278d4b6b/api/openapi-spec/v3/apis__resource.k8s.io__v1alpha3_openapi.json#L115-L140

The resource.v1alpha3.DeviceAttribute is actually referenced by resource.v1alpha3.BasicDevice, so we need to traverse the additionalProperties array and ensure that we mark the g/v/k as being used.

[dims]

/assign @tengqm

[tengqm]

@dims I was thinking when and how I can resolve this defect. Thank you so much. /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, tengqm

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

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/reference-docs/blob/master/OWNERS)~~ [tengqm] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[hakuna-matatah]

/lgtm