Automatic merge from submit-queue (batch tested with PRs 58955, 58968, 58971, 58963, 58298). 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>.

remove --tls-ca-file which had no effect

The flag has had no effect since we started configuring loopback based on the direct cert.  I've marked it deprecated this release so we don't break launch scripts right away, but its coming.  I think we should remove it in 1.11.


```release-note-action-required
kube-apiserver flag --tls-ca-file has had no effect for some time.  It is now deprecated and slated for removal in 1.11.  If you are specifying this flag, you must remove it from your launch config before ugprading to 1.11.
```