Merge pull request #63383 from liggitt/lease-reconciler

Automatic merge from submit-queue (batch tested with PRs 63315, 63383, 63318, 63439). 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>.

Re-enable lease reconciler, fix shutdown race

Fixes #63378
Fixes #57617

* Fixes the openapi script to wait for the apiserver on shutdown (like all the other scripts do)
* Fixes the apiserver shutdown to not hang forever if the kubernetes service reconciler cannot persist to etcd
* Readds https://github.com/kubernetes/kubernetes/pull/58474 to make the default the lease reconciler

```release-note
kube-apiserver: the default `--endpoint-reconciler-type` is now `lease`. The `master-count` endpoint reconciler type is deprecated and will be removed in 1.13.
```

hack/update-openapi-spec.sh

@@ -31,7 +31,11 @@ make -C "${KUBE_ROOT}" WHAT=cmd/kube-apiserver
 
 function cleanup()
 {
-    [[ -n ${APISERVER_PID-} ]] && kill ${APISERVER_PID} 1>&2 2>/dev/null
+    if [[ -n ${APISERVER_PID-} ]]; then
+      kill ${APISERVER_PID} 1>&2 2>/dev/null
+      wait ${APISERVER_PID} || true
+    fi
+    unset APISERVER_PID
 
     kube::etcd::cleanup