Patch config-istio after the configmap is actually created (#10484)
Patch config-istio after the configmap is actually created (#10484)

* Revert "Revert "Patch config-istio after the configmap is actually created (#10450)" (#10462)"

This reverts commit a190ffa319722f2280edbf72cc7fb2cb1e069747.

* Don't fail with file not found
knative/serving,knative/serving