Automatic merge from submit-queue (batch tested with PRs 64723, 64537). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Update istio addon manifest to 0.8 **What this PR does / why we need it:** Update Istio addon version to latest stable 0.8.0. Changes from vanilla istio[-auth].yaml include: - k8s addon Reconcile labels - add all available Istio addons (grafana) - mirror docker images to gcr.io - add auto-injection in default namespace (not reconciled to allow Istio uninstall) - remove instance counts to prevent addon reconcile reverting any manual scaling **Release note**: ```release-note Update version of Istio addon from 0.6.0 to 0.8.0. See https://istio.io/about/notes/0.8.html for full Isto release notes. ```