Automatic merge from submit-queue (batch tested with PRs 63589, 63644, 63861, 63872, 63847). 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>.

Enable CUSTOM_INGRESS_YAML to replace the glbc manifest

This allows for customized versions of the Ingress YAML separate from
stock Kubernetes.

```release-note
NONE
```