Automatic merge from submit-queue. 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>.

accelerators: remove Accelerators from feature gates

Passing this flag is preventing clusters from coming up:

```
server.go:165] unrecognized key: Accelerators
```