istio-release never GA'd and we don't need to keep this code in cf-networking-release. We are removing this because it was using an outdated version of grpc (See https://github.com/cloudfoundry/cf-networking-release/pull/266), but updating it to latest caused other problem with having an empty vip_resolver that causes panic in newer version of grpc for all installations of this release.
Summary
istio-release never GA'd and we don't need to keep this code in cf-networking-release. We are removing this because it was using an outdated version of grpc (See https://github.com/cloudfoundry/cf-networking-release/pull/266), but updating it to latest caused other problem with having an empty vip_resolver that causes panic in newer version of grpc for all installations of this release.