Automatic merge from submit-queue (batch tested with PRs 47806, 49539, 48763, 47049, 50600). 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>..

Allow to specify tls config for etcd in federation coredns provider

Closes: https://github.com/kubernetes/kubernetes/issues/42995

```release-note
CoreDNS provider config allows setting TLS certificates for etcd client.
```