pod label for network (#1546)
pod label for network (#1546)

* add label for assigning a pod's network

* cluster label

* use an annotation instead

* Revert "use an annotation instead"

This reverts commit 24ead1188cdb5675b35fe842545e4f5e5bb35700.

* remove cluster for now

* clarify comment
istio/api,istio/api,istio/api,istio/api