Bugfix: CRD's openapi schema extension cannot be properly serialized

[yue9944882]

Fixes: #1796

this pull allows the yaml serializer to have similar behavior as gson's @SerializedName annotation by registering additional type descriptions.

and i will pick it to past releases after merged, as it's breaking all CRDs w/ the openapi extension.

cc @brendandburns

[NeverRaR]

Yaml.dump() is still not working properly，it will serialize field "x-kubernetes-int-or-string" to
"xKubernetesIntOrString" and "x-kubernetes-int-or-string" like this:

apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: crontabs.stable.example.com
spec:
  group: stable.example.com
  names:
    kind: CronTab
    plural: crontabs
    shortNames:
    - ct
    singular: crontab
  scope: Namespaced
  versions:
  - name: v1
    schema:
      openAPIV3Schema:
        type: object
        properties:
          foo:
            anyOf:
            - type: integer
            - type: string
            pattern: ^.*
            x-kubernetes-int-or-string: true
+           xKubernetesIntOrString: true
          spec:
            type: object
            properties:
              cronSpec:
                type: string
              image:
                type: string
              replicas:
                type: integer
    served: true
    storage: true

[yue9944882]

@NeverRaR nice catch, i fixed CRD dumping in the latest commit

[NeverRaR]

Maybe substitute?

[yue9944882]

yep nailed typo

[brendandburns]

This looks good to me, but waiting for @NeverRaR to lgtm also.

[NeverRaR]

/lgtm

[k8s-ci-robot]

@NeverRaR: changing LGTM is restricted to collaborators

In response to this:

/lgtm

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[NeverRaR]

lgtm

[brendandburns]

/lgtm
/approve

[k8s-ci-robot]

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