Automatic merge from submit-queue (batch tested with PRs 66850, 66902, 66779, 66864, 66912). 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 etcdstorage test to use discovery

1. update etcdstorage test to use discovery
2. switches to use the dynamic client
3. fixes the bug where the server wasn't a complete kube-apiserver


```release-note
NONE
```

/assign @enj @sttts
@kubernetes/sig-api-machinery-pr-reviews 
@apelisse a discovery based example.
 @yue9944882 you've expressed an interest.  The wiring for the server is really hard to use here.

I've also noticed that this doesn't build an equivalent kube-apiserver, but that is proving troublesome.  Will follow up with with.