If we delete the old cr with the propagation policy "orphan", and IMMEDIATELY create the new CR, we will run into the following issue.

[houshengbo]

Describe the bug

{"level":"error","ts":"2020-01-22T16:52:31.083Z","logger":"eventing_operator.knativeeventing-controller","caller":"controller/controller.go:376","msg":"Reconcile error","commit":"90ee8aa","knative.dev/controller":"knativeeventing-controller","error":"ServiceAccount \"eventing-controller\" is invalid: [metadata.ownerReferences.apiVersion: Invalid value: \"\": version must not be empty, metadata.ownerReferences.kind: Invalid value: \"\": kind must not be empty, metadata.ownerReferences.name: Invalid value: \"\": name must not be empty]","stacktrace":"knative.dev/eventing-operator/vendor/knative.dev/pkg/controller.(*Impl).handleErr\n\t/home/prow/go/src/knative.dev/eventing-operator/vendor/knative.dev/pkg/controller/controller.go:376\nknative.dev/eventing-operator/vendor/knative.dev/pkg/controller.(*Impl).processNextWorkItem\n\t/home/prow/go/src/knative.dev/eventing-operator/vendor/knative.dev/pkg/controller/controller.go:362\nknative.dev/eventing-operator/vendor/knative.dev/pkg/controller.(*Impl).Run.func2\n\t/home/prow/go/src/knative.dev/eventing-operator/vendor/knative.dev/pkg/controller/controller.go:310"}
{"level":"info","ts":"2020-01-22T16:52:31.083Z","logger":"eventing_operator.knativeeventing-controller","caller":"controller/controller.go:363","msg":"Reconcile failed. Time taken: 5.0000143s.","commit":"90ee8aa","knative.dev/controller":"knativeeventing-controller","knative.dev/traceid":"ca2cfdab-e7a2-448c-b528-30281a2fb001","knative.dev/key":"knative-eventing/knative-eventing"}
{"level":"info","ts":"2020-01-22T16:52:31.084Z","logger":"eventing_operator.knativeeventing-controller.event-broadcaster","caller":"record/event.go:258","msg":"Event(v1.ObjectReference{Kind:\"Eventing\", Namespace:\"knative-eventing\", Name:\"knative-eventing\", UID:\"c61fc418-98dc-4cb8-96cd-242485d3c9a3\", APIVersion:\"operator.knative.dev/v1alpha1\", ResourceVersion:\"53832\", FieldPath:\"\"}): type: 'Warning' reason: 'InternalError' ServiceAccount \"eventing-controller\" is invalid: [metadata.ownerReferences.apiVersion: Invalid value: \"\": version must not be empty, metadata.ownerReferences.kind: Invalid value: \"\": kind must not be empty, metadata.ownerReferences.name: Invalid value: \"\": name must not be empty]","commit":"90ee8aa","knative.dev/controller":"knativeeventing-controller"}
{"level":"info","ts":"2020-01-22T16:52:31.084Z","logger":"eventing_operator.knativeeventing-controller","caller":"knativeeventing/knativeeventing.go:112","msg":"Reconciling Eventing","commit":"90ee8aa","knative.dev/controller":"knativeeventing-controller","Request.Namespace":"knative-eventing","Request.Name":"knative-eventing","status":{"conditions":[{"type":"InstallSucceeded","status":"Unknown","lastTransitionTime":"2020-01-22T16:51:37Z"},{"type":"Ready","status":"False","lastTransitionTime":"2020-01-22T16:51:41Z","reason":"Manifest Installation","message":"ServiceAccount \"eventing-controller\" is invalid: [metadata.ownerReferences.apiVersion: Invalid value: \"\": version must not be empty, metadata.ownerReferences.kind: Invalid value: \"\": kind must not be empty, metadata.ownerReferences.name: Invalid value: \"\": name must not be empty]"}]}}
{"level":"info","msg":"Merging","diff":"{\"rules\":[]}"}

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