Add delete of "horizontalpodautoscaler.autoscaling/istio-pilot" resource (#921)
Add delete of "horizontalpodautoscaler.autoscaling/istio-pilot" resource (#921)

* Add delete of "horizontalpodautoscaler.autoscaling/istio-pilot" resource

* Don't log NotFound errors

markfisher/sk8s,markfisher/sk8s,markfisher/sk8s,markfisher/sk8s