Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions here: https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md.

Add gnufied as approver for attach/detach controller

Hopefully has reviewed and made enough fixes in this
area to understand the code thoroughly.

```release-note
None
```

/assign @saad-ali @jsafrane