Fix network config patching (#3114)
Fix network config patching (#3114)

* Fix network config patching

Change-Id: I0bb3dd7fc8d49f06ffff0bdb3f84c62443b4dde2

* use kubectl patch

Change-Id: I7c71681f87d934bebb89c7ebf2b595d0a2752ab4

* cleanup

Change-Id: Ic53cb5efff1839c62830d93576f8964f041a8578

knative/serving,knative/serving