Sources open api spec does not include field descriptions.

[vaikas]

Expected Behavior

when dumping the CRD for a source, I'll get a description for each of the fields.

For example, Cloud Scheduler shows:
validation:
openAPIV3Schema:
properties:
apiVersion:
type: string
kind:
type: string
metadata:
type: object
spec:
properties:
body:
description: Optional body to send in the event
type: string
googleCloudProject:
description: Google Cloud Project ID to create the scheduler job in.
type: string
httpMethod:
description: Optional HTTP method to use when delivering the event.
If omitted, uses POST
type: string

Actual Behavior

For example, containersource does not:
validation:
openAPIV3Schema:
properties:
apiVersion:
type: string
kind:
type: string
metadata:
type: object
spec:
properties:
args:
items:
type: string
type: array
env:
items:
type: object
type: array
image:
minLength: 1
type: string

Steps to Reproduce the Problem

1. kubectl get crds containersources.sources.eventing.knative.dev -oyaml
2. look at the output, fields have no description.

Additional Info

[grantr]

Our version of controller-tools doesn't generate this, but that was fixed in kubernetes-sigs/controller-tools#111 (and kubernetes-sigs/controller-tools#118). I think if we upgrade we'll get this for free. @n3wscott is working on that; first step is knative/eventing#726.

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