crd: Add validation using OpenAPI 3.0 (#605)
crd: Add validation using OpenAPI 3.0 (#605)

* crd: Add validation using OpenAPI 3.0

Signed-off-by: Ce Gao <1d82c7e569a19de560a5cb3a123e2745e610ad0f@caicloud.io>

* crd-v1alpha2: Add comment

Signed-off-by: Ce Gao <1d82c7e569a19de560a5cb3a123e2745e610ad0f@caicloud.io>

kubeflow/training-operator,kubeflow/training-operator,kubeflow/training-operator